diff --git a/docs/user-guide/commands.md b/docs/user-guide/commands.md
index 387639f1..09dba250 100644
--- a/docs/user-guide/commands.md
+++ b/docs/user-guide/commands.md
@@ -739,6 +739,9 @@ Example:
 
     $ watson config backend.url http://localhost:4242
     $ watson config backend.token 7e329263e329
+    or
+    $ watson config backend.repo git@github.com:user/repo.git
+    
     $ watson sync
     Received 42 frames from the server
     Pushed 23 frames to the server
diff --git a/docs/user-guide/configuration.md b/docs/user-guide/configuration.md
index be163b8f..fbccd931 100644
--- a/docs/user-guide/configuration.md
+++ b/docs/user-guide/configuration.md
@@ -86,7 +86,21 @@ $ watson config -e
 
 ### Backend
 
-At this time there is no official backend for Watson. We are working on it. But in a near future, you will be able to synchronize Watson with a public (or your private) repository via the [`sync`](./commands.md#sync) command. To configure your repository please set up the `[backend]` section.
+You will be able to synchronize Watson with a public (or your private) repository via the [`sync`](./commands.md#sync) command.
+To configure your repository please set up the `[backend]` section.
+You have two options for synchronization:
+
+- The [crick](https://github.com/TailorDev/crick) server
+- A git repository
+
+If using crick, set `backend.url` and `backend.token`.
+If using a git repository, set `backend.repo`.
+
+
+#### `backend.repo` (default: empty)
+
+The remote URL of a git repository to clone.
+Something like `git@github.com:user/repo.git`.
 
 #### `backend.url` (default: empty)
 
@@ -225,8 +239,7 @@ A basic configuration file looks like the following:
 # Watson configuration
 
 [backend]
-url = https://api.crick.fr
-token = yourapitoken
+repo = git@github.com:user/repo.git
 
 [options]
 stop_on_start = true
diff --git a/watson/cli.py b/watson/cli.py
index 377b76b5..1fbd36fd 100644
--- a/watson/cli.py
+++ b/watson/cli.py
@@ -1519,16 +1519,19 @@ def sync(watson):
     \b
     $ watson config backend.url http://localhost:4242
     $ watson config backend.token 7e329263e329
+    or
+    $ watson config backend.repo git@github.com:user/repo.git
+    \b
     $ watson sync
     Received 42 frames from the server
     Pushed 23 frames to the server
     """
     last_pull = arrow.utcnow()
     pulled = watson.pull()
-    click.echo("Received {} frames from the server".format(len(pulled)))
+    click.echo("Received {} frames from the server".format(pulled))
 
     pushed = watson.push(last_pull)
-    click.echo("Pushed {} frames to the server".format(len(pushed)))
+    click.echo("Pushed {} frames to the server".format(pushed))
 
     watson.last_sync = arrow.utcnow()
     watson.save()
diff --git a/watson/watson.py b/watson/watson.py
index 7ab7da12..8951c97a 100644
--- a/watson/watson.py
+++ b/watson/watson.py
@@ -7,6 +7,7 @@
 from configparser import Error as CFGParserError
 import arrow
 import click
+import subprocess
 
 from .config import ConfigParser
 from .frames import Frames
@@ -54,6 +55,7 @@ def __init__(self, **kwargs):
         self.frames_file = os.path.join(self._dir, 'frames')
         self.state_file = os.path.join(self._dir, 'state')
         self.last_sync_file = os.path.join(self._dir, 'last_sync')
+        self.sync_dir = os.path.join(self._dir, 'sync_repo')
 
         if 'frames' in kwargs:
             self.frames = kwargs['frames']
@@ -371,43 +373,62 @@ def _get_remote_projects(self):
         return self._remote_projects['projects']
 
     def pull(self):
-        import requests
-        dest, headers = self._get_request_info('frames')
 
-        try:
-            response = requests.get(
-                dest, params={'last_sync': self.last_sync}, headers=headers
-            )
-            assert response.status_code == 200
-        except requests.ConnectionError:
-            raise WatsonError("Unable to reach the server.")
-        except AssertionError:
-            raise WatsonError(
-                "An error occurred with the remote "
-                "server: {}".format(response.json())
-            )
+        repo = self.config.get('backend', 'repo')
+        if repo:
+            # clone git repository if necessary
+            if not os.path.isdir(self.sync_dir):
+                subprocess.run(['git', 'clone', repo, self.sync_dir], check=True)
+
+            # git pull
+            subprocess.run(['git', 'pull'], cwd=self.sync_dir, check=True)
+            sync_file = os.path.join(self.sync_dir, 'frames')
+            try:
+                with open(sync_file, 'r') as f:
+                    frames = json.load(f)
+            except FileNotFoundError:
+                frames = []
+        else:
+            import requests
+            dest, headers = self._get_request_info('frames')
+
+            try:
+                response = requests.get(
+                    dest, params={'last_sync': self.last_sync}, headers=headers
+                )
+                assert response.status_code == 200
+            except requests.ConnectionError:
+                raise WatsonError("Unable to reach the server.")
+            except AssertionError:
+                raise WatsonError(
+                    "An error occurred with the remote "
+                    "server: {}".format(response.json())
+                )
 
-        frames = response.json() or ()
+            frames = response.json() or ()
 
+        updated_frames = 0
         for frame in frames:
             frame_id = uuid.UUID(frame['id']).hex
-            self.frames[frame_id] = (
-                frame['project'],
-                frame['begin_at'],
-                frame['end_at'],
-                frame['tags']
-            )
+            try:
+                self.frames[frame_id]
+            except KeyError:
+                updated_frames += 1
+                self.frames[frame_id] = (
+                    frame['project'],
+                    frame['begin_at'],
+                    frame['end_at'],
+                    frame['tags']
+                )
 
-        return frames
+        return updated_frames
 
     def push(self, last_pull):
-        import requests
-        dest, headers = self._get_request_info('frames/bulk')
 
         frames = []
-
-        for frame in self.frames:
-            if last_pull > frame.updated_at > self.last_sync:
+        repo = self.config.get('backend', 'repo')
+        if repo:
+            for frame in self.frames:
                 frames.append({
                     'id': uuid.UUID(frame.id).urn,
                     'begin_at': str(frame.start.to('utc')),
@@ -416,21 +437,61 @@ def push(self, last_pull):
                     'tags': frame.tags
                 })
 
-        try:
-            response = requests.post(dest, json.dumps(frames), headers=headers)
-            assert response.status_code == 201
-        except requests.ConnectionError:
-            raise WatsonError("Unable to reach the server.")
-        except AssertionError:
-            raise WatsonError(
-                "An error occurred with the remote server (status: {}). "
-                "Response was:\n{}".format(
-                    response.status_code,
-                    response.text
+            # Get number of synced frames
+            sync_file = os.path.join(self.sync_dir, 'frames')
+            try:
+                with open(sync_file, 'r') as f:
+                    n_frames = len(json.load(f))
+            except FileNotFoundError:
+                n_frames = 0
+
+            # Write frames to repo
+            with open(sync_file, 'w') as f:
+                json.dump(frames, f, indent=2)
+
+            # Check if anything has changed
+            try:
+                subprocess.run(['git', 'diff', '--quiet'], cwd=self.sync_dir, check=True)
+                return 0
+            except subprocess.CalledProcessError:
+                pass
+
+            # git push
+            subprocess.run(['git', 'add', 'frames'], cwd=self.sync_dir, check=True)
+            subprocess.run(['git', 'commit', '-m', '...'], cwd=self.sync_dir, check=True)
+            subprocess.run(['git', 'push'], cwd=self.sync_dir, check=True)
+
+            return len(frames) - n_frames
+
+        else:
+            import requests
+            dest, headers = self._get_request_info('frames/bulk')
+
+            for frame in self.frames:
+                if last_pull > frame.updated_at > self.last_sync:
+                    frames.append({
+                        'id': uuid.UUID(frame.id).urn,
+                        'begin_at': str(frame.start.to('utc')),
+                        'end_at': str(frame.stop.to('utc')),
+                        'project': frame.project,
+                        'tags': frame.tags
+                    })
+
+            try:
+                response = requests.post(dest, json.dumps(frames), headers=headers)
+                assert response.status_code == 201
+            except requests.ConnectionError:
+                raise WatsonError("Unable to reach the server.")
+            except AssertionError:
+                raise WatsonError(
+                    "An error occurred with the remote server (status: {}). "
+                    "Response was:\n{}".format(
+                        response.status_code,
+                        response.text
+                    )
                 )
-            )
 
-        return frames
+            return len(frames)
 
     def merge_report(self, frames_with_conflict):
         conflict_file_frames = Frames(self._load_json_file(