diff --git a/bin/sync_savegames b/bin/sync_savegames
new file mode 100755
index 0000000..39777f3
--- /dev/null
+++ b/bin/sync_savegames
@@ -0,0 +1,42 @@
+#!/usr/bin/env python3
+#pylint:disable=no-member
+
+from pathlib import Path
+from steamsync import SteamSync, SyncOp
+
+
+# Find home
+steamns_home = Path("~/.local/steam/home/taeyeon/").expanduser()
+
+if steamns_home.exists():
+    home = steamns_home
+else:
+    home = Path("~").expanduser()
+
+sync = SteamSync(Path("~/Nextcloud/Misc/Savegames").expanduser())
+
+
+@sync.by_name("zanzarah")
+def zanzarah(op):
+    with op.game_directory.prefix("Save") as set:
+        set += "*"
+        set.execute()
+
+#@sync.by_id(787860)
+def fs19(op):
+    with op.my_documents.prefix("My Games/FarmingSimulator2019") as set:
+        set.add(
+            "music/streamingInternetRadios.xml",
+            "savegame[1-9]",
+            "savegame[1-2][0-9]"
+            "VERSION",
+        )
+        set.execute()
+
+#@sync.by_name("Fell Seal")
+def fell_seal(op):
+    with op.from_(home).prefix("Fell Seal") as set:
+        set += "saves"
+        set += "customdata"
+        set.execute()
+
diff --git a/lib/python/steamsync.py b/lib/python/steamsync.py
new file mode 100644
index 0000000..80c402e
--- /dev/null
+++ b/lib/python/steamsync.py
@@ -0,0 +1,246 @@
+#!/usr/bin/env python3
+
+import sys, os
+
+import fnmatch
+import re
+import itertools
+import shutil
+
+from pathlib import Path
+from typing import Tuple, Dict, List, Union, Set, Callable, Any
+
+from steamutil import Steam, App, CachedProperty
+
+
+class AppNotFoundType:
+    def __call__(self, func) -> None:
+        pass
+
+    def __bool__(self) -> bool:
+        return False
+
+AppNotFound = AppNotFoundType()
+
+
+class SyncPath:
+    __slots__ = "op", "local", "common"
+
+    op: 'SyncOp'
+    local: Path
+    common: Path
+
+    def __init__(self, op, local, common="."):
+        self.op = op
+        self.local = Path(local)
+        self.common  = Path(common)
+    
+    def prefix(self, component: Union[str, Path]) -> 'SyncPath':
+        return SyncPath(self.op, self.local / component, self.common)
+    
+    def __div__(self, component: Union[str, Path]) -> 'SyncPath':
+        return SyncPath(self.op, self.local, self.common / component)
+    
+    @property
+    def path(self) -> Path:
+        return self.local / self.common
+    
+    @property
+    def target_path(self) -> Path:
+        return self.op.target_path / self.common
+    
+    def __enter__(self) -> 'SyncSet':
+        return SyncSet(self)
+    
+    def __exit__(self, type, value, traceback):
+        # Todo: auto-commit?
+        pass
+
+
+class SyncSet:
+    FileStatSet = Dict[Path, Tuple[Path, os.stat_result]]
+
+    op: 'SyncOp'
+    spath: SyncPath
+    local: FileStatSet
+    target: FileStatSet
+    changeset: int
+
+    def __init__(self, path):
+        self.op = path.op
+        self.spath = path
+        self.local = {}
+        self.target = {}
+    
+    @property
+    def path(self) -> Path:
+        return self.spath.path
+    
+    @property
+    def target_path(self) -> Path:
+        return self.spath.target_path
+
+    # Modify inclusion
+    @staticmethod
+    def _collect_files(anchor: Path, patterns: List[str]):
+        files: SyncSet.FileStatSet = {}
+        def add_file(f):
+            if f.is_file():
+                files[f.relative_to(anchor)] = f, f.stat()
+            elif f.is_dir():
+                for f in f.iterdir():
+                    add_file(f)
+        for f in set(itertools.chain.from_iterable(anchor.glob(g) for g in patterns)):
+            add_file(f)
+        return files
+
+    def add(self, *patterns):
+        self.local.update(self._collect_files(self.path, patterns))
+        self.target.update(self._collect_files(self.target_path, patterns))
+        self._inval()
+    
+    def __iadd__(self, pattern: str) -> 'SyncSet':
+        self.add(pattern)
+        return self
+    
+    # Calculate changes
+    def _inval(self):
+        for cache in "files_from_local", "files_from_target", "files_unmodified":
+            if cache in self.__dict__:
+                del self.__dict__[cache]
+
+    @staticmethod
+    def _sync_set(src_files: FileStatSet, dst_files: FileStatSet) -> Set[Path]:
+        """
+        Return a set of files that need to be updated from src to dst.
+        """
+        return {f
+                for f, (_, sst) in src_files.items()
+                if f not in dst_files or sst.st_mtime > dst_files[f][1].st_mtime
+        }
+    
+    @CachedProperty
+    def files_from_local(self) -> Set[Path]:
+        return self._sync_set(self.local, self.target)
+    
+    @CachedProperty
+    def files_from_target(self) -> Set[Path]:
+        return self._sync_set(self.target, self.local)
+    
+    @CachedProperty
+    def files_unmodified(self) -> Set[Path]:
+        return (self.local.keys() | self.target.keys()) - (self.files_from_local | self.files_from_target)
+    
+    def show_confirm(self) -> bool:
+        # XXX: move to SyncOp?
+        print("  Local is newer: ", ", ".join(map(str, self.files_from_local)))
+        print("  Target is newer: ", ", ".join(map(str, self.files_from_target)))
+        print("  Unmodified: ", ", ".join(map(str, self.files_unmodified)))
+
+        print("Press enter to continue")
+        input()
+        return True # TODO: Proper thingey
+
+    def execute(self, *, make_inconsistent=False) -> bool:
+        operations = []
+        if self.files_from_local:
+            if self.files_from_target and not make_inconsistent:
+                self.op.report_error(["Both sides have changed files. Synchronizing would lead to inconsistent and possibly broken savegames."])
+                return False
+            operations += [(self.path / p, self.target_path / p) for p in self.files_from_local] #pylint:disable=not-an-iterable
+
+        if self.files_from_target:
+            operations += [(self.target_path / p, self.path / p) for p in self.files_from_target] #pylint:disable=not-an-iterable
+        
+        return self.op._do_copy(operations)
+
+
+class SyncOp:
+    parent: 'SteamSync'
+    app: App
+
+    def __init__(self, ssync, app):
+        self.parent = ssync
+        self.app = app
+    
+    def __call__(self, func: Callable[['SyncOp'],Any]):
+        # For decorator use
+        self._report_begin()
+        return func(self)
+
+    def _do_copy(self, ops: List[Tuple[Path, Path]]) -> bool:
+        for src, dst in ops:
+            if not dst.parent.exists():
+                dst.parent.mkdir(parents=True)
+
+            print("   \033[36m%s -> %s\033[0m" % (src, dst))
+            shutil.copy2(src, dst)
+        return True
+    
+    # UI
+    def _report_begin(self):
+        print("\033[34mNow Synchronizing App %s\033[0m" % self.app.name)
+
+    def report_error(self, msg: List[str]):
+        print("\033[31m"+"\n".join("  " + l for l in msg)+"\033[0m")
+    
+    @CachedProperty
+    def target_path(self) -> Path:
+        return self.parent.target_path / self.app.install_dir
+    
+    @CachedProperty
+    def my_documents(self) -> SyncPath:
+        """ Get the Windows "My Documents" folder """
+        if sys.platform.startswith("linux"):
+            # TODO: what about native games?
+            return SyncPath(self, self.app.compat_drive / "users/steamuser/My Documents")
+        elif sys.platform == "win32":
+            def get_my_documents():
+                import ctypes.wintypes
+                CSIDL_PERSONAL = 5       # My Documents
+                SHGFP_TYPE_CURRENT = 0   # Get current, not default value
+
+                buf = ctypes.create_unicode_buffer(ctypes.wintypes.MAX_PATH)
+                ctypes.windll.shell32.SHGetFolderPathW(None, CSIDL_PERSONAL, None, SHGFP_TYPE_CURRENT, buf)
+
+                return buf.value
+            return SyncPath(self, get_my_documents())
+        else:
+            raise Exception("Platform not supported")
+    
+    @property
+    def game_directory(self) -> SyncPath:
+        return SyncPath(self, self.app.install_path)
+    
+    def from_(self, path: Path) -> SyncPath:
+        return SyncPath(self, path)
+
+
+class SteamSync:
+    target_path: Path
+    steam: Steam
+
+    def __init__(self, target_path: Path, *, steam_path: Path = None):
+        self.target_path = Path(target_path)
+        self.steam = Steam(steam_path)
+    
+    @CachedProperty
+    def apps(self) -> List[App]:
+        return list(self.steam.apps)
+    
+    def by_id(self, appid):
+        app = self.steam.get_app(appid)
+        if app is not None:
+            return SyncOp(self, app)
+        else:
+            return AppNotFound
+    
+    def by_name(self, pattern):
+        pt = re.compile(fnmatch.translate(pattern).rstrip("\\Z"), re.IGNORECASE)
+        app = None
+        for candidate in self.apps: #pylint:disable=not-an-iterable
+            if pt.search(candidate.name):
+                if app is not None:
+                    raise Exception("Encountered more than one possible App matching '%s'" % pattern)
+                app = candidate
+        return SyncOp(self, app)
diff --git a/lib/python/steamutil.py b/lib/python/steamutil.py
new file mode 100644
index 0000000..2a08a24
--- /dev/null
+++ b/lib/python/steamutil.py
@@ -0,0 +1,374 @@
+# Discover Steam install and games
+# (c) 2020 Taeyeon Mori CC-BY-SA
+
+import sys, os
+import re, fnmatch, datetime
+
+from pathlib import Path
+from typing import List, Iterable, Dict, Tuple, Callable, Optional, Union
+
+from vdfparser import VdfParser, DeepDict
+
+
+class CachedProperty:
+    """ A property that is only computed once per instance and then replaces
+        itself with an ordinary attribute. Deleting the attribute resets the
+        property.
+
+        Source: https://github.com/bottlepy/bottle/commit/fa7733e075da0d790d809aa3d2f53071897e6f76
+        """
+
+    def __init__(self, func):
+        self.__doc__ = getattr(func, '__doc__')
+        self.func = func
+
+    def __get__(self, obj, cls):
+        if obj is None:
+            return self
+        value = obj.__dict__[self.func.__name__] = self.func(obj)
+        return value
+
+
+class DictPathRoProperty:
+    __slots__ = "property", "path", "default"
+    _nodefault = object()
+
+    def __init__(self, property: str, path: Tuple[str], default=_nodefault):
+        self.property = property
+        self.path = path
+        self.default = default
+    
+    def __get__(self, obj, cls):
+        if obj is None:
+            return self
+        d = getattr(obj, self.property)
+        try:
+            for pc in self.path:
+                d = d[pc]
+        except KeyError:
+            if self.default is not self._nodefault:
+                return self.default
+            raise
+        else:
+            return d
+
+
+class DictPathProperty(DictPathRoProperty):
+    __slots__ = ()
+
+    def _get_create_parent(self, obj) -> Dict:
+        d = getattr(obj, self.property)
+        for pc in self.path[:-1]:
+            try:
+                d = d[pc]
+            except KeyError:
+                nd = {}
+                d[pc] = nd
+                d = nd
+        return d
+
+    def __set__(self, obj, value):
+        self._get_create_parent(obj)[self.path[-1]] = value
+    
+    def __delete__(self, obj):
+        del self._get_create_parent(obj)[self.path[-1]]
+
+
+_vdf = VdfParser()
+
+
+class App:
+    steam: 'Steam'
+    library_folder: 'LibraryFolder'
+    steamapps_path: Path
+    manifest_path: Path
+    manifest: DeepDict
+
+    def __init__(self, libfolder, manifest_path: Path, *, manifest_data=None):
+        self.steam = libfolder.steam
+        self.library_folder = libfolder
+        self.steamapps_path = libfolder.steamapps_path
+
+        self.manifest_path = manifest_path
+        if manifest_data is None:
+            with open(manifest_path) as f:
+                self.manifest = _vdf.parse(f)
+        else:
+            self.manifest = manifest_data
+    
+    def __repr__(self):
+        return "<steamutil.App %d '%s' @ \"%s\">" % (self.appid, self.name, self.install_path)
+    
+    # Basic info
+    @property
+    def appid(self) -> int:
+        return int(self.manifest["AppState"]["appid"])
+
+    name  = DictPathRoProperty("manifest", ("AppState", "name"))
+    language = DictPathRoProperty("manifest", ("AppState", "UserConfig", "language"), None)
+    install_dir = DictPathRoProperty("manifest", ("AppState", "installdir"))
+    
+    @CachedProperty
+    def install_path(self) -> Path:
+        return self.steamapps_path / "common" / self.install_dir
+    
+    def get_userdata_path(self, user_id: Union[int, 'LoginUser']) -> Path:
+        return self.steam.get_userdata_path(user_id) / str(self.appid)
+    
+    # Workshop
+    # TODO
+    @CachedProperty
+    def workshop_path(self) -> Path:
+        return self.steamapps_path / "workshop" / "content" / str(self.appid)
+
+    # Steam Play info
+    @CachedProperty
+    def compat_path(self) -> Path:
+        return self.steamapps_path / "compatdata" / str(self.appid)
+    
+    @CachedProperty
+    def compat_drive(self) -> Path:
+        return self.compat_path / "pfx" / "drive_c"
+    
+    # Install size
+    declared_install_size = DictPathRoProperty("manifest", ("AppState", "SizeOnDisk"), 0)
+    
+    def compute_install_size(self) -> int:
+        def sum_size(p: Path):
+            acc = 0
+            for x in p.iterdir():
+                if x.is_dir():
+                    acc += sum_size(x)
+                else:
+                    acc += x.stat().st_size
+            return acc
+        return sum_size(self.install_path)
+
+
+class LibraryFolder:
+    steam: 'Steam'
+    path: Path
+
+    def __init__(self, steam: 'Steam', path: Path):
+        self.steam = steam
+        self.path = path
+    
+    def __repr__(self):
+        return "<steamutil.LibraryFolder @ \"%s\">" % self.path
+
+    # Paths
+    @CachedProperty
+    def steamapps_path(self) -> Path:
+        steamapps = self.path / "steamapps"
+        if not steamapps.exists():
+            # Emulate case-insensitivity
+            cased = self.path / "SteamApps"
+            if cased.exists():
+                steamapps = cased
+            else:
+                # try to find other variation
+                found = [d for d in self.path.iterdir() if d.is_dir() and d.name.lower() == "steamapps"]
+                if len(found) > 1:
+                    raise Exception("More than one steamapps folder in library folder", self.path)
+                elif found:
+                    return found[0]
+            # if none exists, return non-existant default name
+        return steamapps
+    
+    @property
+    def common_path(self) -> Path:
+        return self.steamapps_path / "common"
+
+    @property
+    def appmanifests(self) -> Iterable[Path]:
+        return self.steamapps_path.glob("appmanifest_*.acf") # pylint:disable=no-member
+
+    @property
+    def apps(self) -> Iterable[App]:
+        return (App(self, mf) for mf in self.appmanifests)
+
+    def get_app(self, appid: int) -> Optional[App]:
+        manifest = self.steamapps_path / ("appmanifest_%d.acf" % appid)
+        if manifest.exists():
+            return App(self, manifest)
+
+    def find_apps_re(self, regexp: str) -> Iterable[App]:
+        reg = re.compile(r'"name"\s+".*%s.*"' % regexp, re.IGNORECASE)
+        for manifest in self.appmanifests: #pylint:disable=not-an-iterable
+            with open(manifest) as f:
+                content = f.read()
+            if reg.search(content):
+                yield App(self, manifest, manifest_data=_vdf.parse_string(content))
+
+    def find_apps(self, pattern: str) -> Iterable[App]:
+        return self.find_apps_re(fnmatch.translate(pattern).rstrip("\\Z"))
+
+
+class UserAppConfig:
+    user: 'LoginUser'
+    appid: int
+
+    def __init__(self, user, appid):
+        self.user = user
+        self.appid = appid
+    
+    def __repr__(self):
+        return "<steamutil.UserAppConfig appid=%d for account %s>" % (self.appid, self.user.account_name)
+    
+    @property
+    def _data(self):
+        try:
+            return self.user.localconfig["UserLocalConfigStore"]["Software"]["Valve"]["Steam"]["Apps"][str(self.appid)]
+        except KeyError:
+            return {} # TODO
+    
+    @property
+    def last_played(self) -> datetime.datetime:
+        return datetime.datetime.fromtimestamp(int(self._data.get("LastPlayed", "0")))
+    
+    @property
+    def playtime(self) -> datetime.time:
+        t = int(self._data.get("Playtime", "0"))
+        return datetime.time(t // 60, t % 60)
+    
+    @property
+    def playtime_two_weeks(self) -> datetime.time:
+        t = int(self._data.get("Playtime2wks", "0"))
+        return datetime.time(t // 60, t % 60)
+    
+    launch_options = DictPathProperty("_data", ("LaunchOptions",), None)
+
+
+class LoginUser:
+    steam: 'Steam'
+    id: int
+    info: Dict[str, str]
+
+    def __init__(self, steam, id: int, info: Dict):
+        self.steam = steam
+        self.id = id
+        self.info = info
+    
+    def __repr__(self):
+        return "<steamutil.LoginUser %d %s '%s'>" % (self.id , self.account_name, self.username)
+    
+    @property
+    def account_id(self):
+        """ 32-bit account ID """
+        return self.id & 0xffffffff
+    
+    account_name = DictPathRoProperty("info", ("AccountName",))
+    username = DictPathRoProperty("info", ("PersonaName",))
+
+    @CachedProperty
+    def userdata_path(self) -> Path:
+        return self.steam.get_userdata_path(self)
+    
+    @property
+    def localconfig_vdf(self) -> Path:
+        return self.userdata_path / "config" / "localconfig.vdf"
+    
+    @CachedProperty
+    def localconfig(self) -> DeepDict:
+        with open(self.localconfig_vdf) as f:
+            return _vdf.parse(f)
+    
+    # Game config
+    def get_app_config(self, app: Union[int, App]) -> Optional[UserAppConfig]:
+        if isinstance(app, App):
+            app = app.appid
+        return UserAppConfig(self, app)
+
+
+class Steam:
+    root: Path
+
+    def __init__(self, install_path=None):
+        self.root = install_path if install_path is not None else self.find_install_path()
+        if self.root is None:
+            raise Exception("Could not find Steam")
+    
+    def __repr__(self):
+        return "<steamutil.Steam @ \"%s\">" % self.root
+
+    @staticmethod
+    def find_install_path() -> Optional[Path]:
+        # TODO: Windows
+        # Linux
+        if sys.platform.startswith("linux"):
+            # Try ~/.steam first
+            dotsteam = Path(os.path.expanduser("~/.steam"))
+            if dotsteam.exists():
+                steamroot = (dotsteam / "root").resolve()
+                if steamroot.exists():
+                    return steamroot
+            # Try ~/.local/share/Steam, classic ~/Steam
+            data_dir = Path(os.environ.get("XDG_DATA_HOME", "~/.local/share")).expanduser()
+            for path in data_dir, Path("~").expanduser():
+                for name in "Steam", "SteamBeta":
+                    steamroot = path / name
+                    if steamroot.exists():
+                        return steamroot
+
+    # Various paths
+    @property
+    def libraryfolders_vdf(self) -> Path:
+        """ The libraryfolders.vdf file listing all configured library locations """
+        return self.root / "steamapps" / "libraryfolders.vdf"
+    
+    @property
+    def config_vdf(self) -> Path:
+        return self.root / "config" / "config.vdf"
+    
+    @property
+    def loginusers_vdf(self) -> Path:
+        return self.root / "config" / "loginusers.vdf"
+    
+    # Users
+    @CachedProperty
+    def most_recent_user(self) -> Optional[LoginUser]:
+        try:
+            with open(self.loginusers_vdf) as f:
+                data = _vdf.parse(f)
+            for id, info in data["users"].items():
+                if info["mostrecent"] == "1":
+                    return LoginUser(self, int(id), info)
+        except KeyError:
+            pass
+        return None
+    
+    def get_userdata_path(self, user_id: Union[int, LoginUser]) -> Path:
+        if isinstance(user_id, LoginUser):
+            user_id = user_id.account_id
+        return self.root / "userdata" / str(user_id)
+
+    # Game/App Library
+    @CachedProperty
+    def library_folder_paths(self) -> List[Path]:
+        with open(self.libraryfolders_vdf) as f:
+            return [Path(v) for k,v in _vdf.parse(f)["LibraryFolders"].items() if k.isdigit()]
+    
+    @CachedProperty
+    def library_folders(self) -> List[LibraryFolder]:
+        return [LibraryFolder(self, self.root)] + [LibraryFolder(self, p) for p in self.library_folder_paths] #pylint:disable=not-an-iterable
+    
+    @property
+    def apps(self) -> Iterable[App]:
+        for lf in self.library_folders: #pylint:disable=not-an-iterable
+            yield from lf.apps
+    
+    def get_app(self, id: int) -> Optional[App]:
+        for lf in self.library_folders: #pylint:disable=not-an-iterable
+            app = lf.get_app(id)
+            if app is not None:
+                return app
+
+    def find_apps(self, pattern: str) -> Iterable[App]:
+        for lf in self.library_folders: #pylint:disable=not-an-iterable
+            yield from lf.find_apps(pattern)
+    
+    def find_app(self, pattern: str) -> Optional[App]:
+        for app in self.find_apps(pattern):
+            return app
+    
+
diff --git a/lib/python/vdfparser.py b/lib/python/vdfparser.py
index 6336bf1..8624a6d 100644
--- a/lib/python/vdfparser.py
+++ b/lib/python/vdfparser.py
@@ -1,12 +1,16 @@
 #!/usr/bin/env python3
 # Parse Steam/Source VDF Files
 # Reference: https://developer.valvesoftware.com/wiki/KeyValues#File_Format
-# (c) 2015 Taeyeon Mori; CC-BY-SA
+# (c) 2015-2020 Taeyeon Mori; CC-BY-SA
 
 from __future__ import unicode_literals
 
 import io
 
+from typing import Dict, Union
+
+DeepDict = Dict[str, Union[str, "DeepDict"]]
+
 
 class VdfParser:
     """
@@ -113,13 +117,13 @@ class VdfParser:
                 else:
                     current.append(c)
 
-    def parse(self, fd):
+    def parse(self, fd) -> DeepDict:
         """
         Parse a VDF file into a python dictionary
         """
         return self._parse_map(fd)
 
-    def parse_string(self, content):
+    def parse_string(self, content) -> DeepDict:
         """
         Parse the content of a VDF file
         """
@@ -137,7 +141,7 @@ class VdfParser:
             def write(str=None, i=False, d=False, nl=False):
                 if str:
                     fd.write(str)
-                if delim:
+                if d:
                     fd.write(" ")
         
         else:
@@ -165,7 +169,7 @@ class VdfParser:
                 write(self._make_literal(v))
             write(d=1, nl=1)
     
-    def write(self, fd, dictionary, *, pretty=True):
+    def write(self, fd, dictionary: DeepDict, *, pretty=True):
         """
         Write a dictionary to a file in VDF format
         """