diff --git a/cli/src/main.rs b/cli/src/main.rs
index b7b59c4..5ffec85 100644
--- a/cli/src/main.rs
+++ b/cli/src/main.rs
@@ -58,6 +58,11 @@ pub enum Error {
 
     #[snafu(display("Error importing data: {}", source))]
     ImportError { source: Box<dyn std::error::Error> },
+
+    #[snafu(display("Errors synchronizing data: {:?}", errors))]
+    SyncError {
+        errors: Vec<RepositoryError<SyncFolderStoreError>>,
+    },
 }
 
 fn main() {
@@ -75,6 +80,7 @@ fn main() {
 fn run() -> Result<(), Error> {
     let opt = Opt::from_args();
 
+    // Load config
     let conf_file = match opt.config {
         Some(config_path) => config_path,
         None => {
@@ -82,31 +88,37 @@ fn run() -> Result<(), Error> {
             proj_dirs.config_dir().join("config.toml")
         }
     };
-
     let conf = config::load_config(&conf_file).context(GetConfig {})?;
 
+    // Load store for own data
     let store = SyncFolderStore::new(conf.sync_folder.into(), conf.device_id).should_init(true);
     let mut repo = Repository::from_store(store).unwrap();
+
+    // Synchronize data
+    repo.try_sync_data()
+        .map_err(|errors| Error::SyncError { errors })?;
+    repo.save_meta().unwrap();
+
+    // Convert abstract patch data structure into a more conventional format
     let eventgraph = repo.timesheet();
     let timesheet = eventgraph
         .flatten()
         .map_err(|conflicts| Error::MergeConflicts { conflicts })?;
 
+    // Run command
     match opt.cmd.unwrap_or(Command::default()) {
         Command::Start(subcmd) => {
             let patches = subcmd.exec(&timesheet);
             for patch in patches {
-                let patch_ref = String::new();
-                let res = repo.add_patch(patch).unwrap();
-                println!("{}: {:?}", patch_ref, res);
+                println!("{}", patch.patch_ref());
+                repo.add_patch(patch).unwrap();
             }
         }
         Command::Import(subcmd) => {
             let patches = subcmd.exec(&timesheet).context(ImportError {})?;
             for patch in patches {
-                let patch_ref = String::new();
-                let res = repo.add_patch(patch).unwrap();
-                println!("{}: {:?}", patch_ref, res);
+                println!("{}", patch.patch_ref());
+                repo.add_patch(patch).unwrap();
             }
         }
         Command::Summary(subcmd) => subcmd.exec(&timesheet),
@@ -114,6 +126,7 @@ fn run() -> Result<(), Error> {
         Command::Tags(subcmd) => subcmd.exec(&timesheet),
     };
 
+    // Save which patches this device uses to disk
     repo.save_meta().unwrap();
 
     Ok(())
diff --git a/core/src/repository.rs b/core/src/repository.rs
index 1afc6ae..79cf10d 100644
--- a/core/src/repository.rs
+++ b/core/src/repository.rs
@@ -37,6 +37,9 @@ where
         conflicts: Vec<TimesheetError>,
         patch: PatchRef,
     },
+
+    #[snafu(display("IOError: {}", source))]
+    IOError { source: IE },
 }
 
 #[derive(Debug)]
@@ -114,17 +117,15 @@ where
         &self.timesheet
     }
 
-    fn load_all_patches(&mut self) -> Result<(), Vec<Error<S::Error>>> {
+    fn load_patches(
+        &mut self,
+        patches: impl Iterator<Item = PatchRef>,
+    ) -> Result<(), Vec<Error<S::Error>>> {
         let mut errors = Vec::new();
 
         let mut error_on_loading: BTreeSet<PatchRef> = BTreeSet::new();
 
-        let meta = self
-            .store
-            .get_meta()
-            .context(LoadMeta {})
-            .map_err(|e| vec![e])?;
-        let mut patches_to_load: VecDeque<PatchRef> = meta.patches().cloned().collect();
+        let mut patches_to_load: VecDeque<PatchRef> = patches.collect();
         while let Some(patch_ref) = patches_to_load.pop_front() {
             let patch = match self.store.get_patch(&patch_ref) {
                 Ok(p) => p,
@@ -161,4 +162,38 @@ where
             Ok(())
         }
     }
+
+    fn load_all_patches(&mut self) -> Result<(), Vec<Error<S::Error>>> {
+        let meta = self
+            .store
+            .get_meta()
+            .context(LoadMeta {})
+            .map_err(|e| vec![e])?;
+
+        self.load_patches(meta.patches().cloned())
+    }
+}
+
+use crate::store::sync_folder_store::{SyncFolderStore, SyncFolderStoreError};
+
+impl Repository<SyncFolderStore> {
+    pub fn try_sync_data(&mut self) -> Result<(), Vec<Error<SyncFolderStoreError>>> {
+        let metas = self
+            .store
+            .get_other_metas()
+            .context(IOError {})
+            .map_err(|e| vec![e])?;
+
+        let patches_to_load: Vec<PatchRef> = metas
+            .filter_map(|x| x.ok())
+            .flat_map(|meta| {
+                meta.patches()
+                    .map(|x| x.clone())
+                    .collect::<Vec<_>>()
+                    .into_iter()
+            })
+            .collect();
+
+        self.load_patches(patches_to_load.into_iter())
+    }
 }
diff --git a/core/src/store/sync_folder_store.rs b/core/src/store/sync_folder_store.rs
index bedaf13..92563e7 100644
--- a/core/src/store/sync_folder_store.rs
+++ b/core/src/store/sync_folder_store.rs
@@ -47,6 +47,9 @@ pub enum SyncFolderStoreError {
         source: std::io::Error,
         path: PathBuf,
     },
+
+    #[snafu(display("IO error: {}", source))]
+    IOError { source: std::io::Error },
 }
 
 impl SyncFolderStore {
@@ -70,6 +73,30 @@ impl SyncFolderStore {
             .join(self.device_id.clone())
             .with_extension("toml")
     }
+
+    pub fn get_other_metas(
+        &self,
+    ) -> Result<impl Iterator<Item = Result<Meta, SyncFolderStoreError>>, SyncFolderStoreError>
+    {
+        let meta_folder = self.root_folder.join("meta");
+        let meta_file = self.meta_file_path();
+
+        let sync_folder_items = meta_folder.read_dir().context(IOError {})?;
+        let iter = sync_folder_items
+            .filter_map(|d| d.ok())
+            .filter(move |dir_entry| dir_entry.path() != meta_file)
+            .map(|dir_entry| {
+                let path = dir_entry.path();
+                let contents = read_to_string(&path).context(ReadFile { path: path.clone() })?;
+
+                let meta = toml::de::from_str(&contents).context(DeserializeMeta {
+                    device_id: path.display().to_string(),
+                })?;
+
+                Ok(meta)
+            });
+        Ok(iter)
+    }
 }
 
 impl Store for SyncFolderStore {