diff --git a/src/backup.rs b/src/backup.rs
index 4394ac2..11153f7 100644
--- a/src/backup.rs
+++ b/src/backup.rs
@@ -7,15 +7,15 @@ use crate::repository::Repository;
 
 pub struct Engine<'a> {
     source_path: &'a Path,
-    repository: &'a Repository<'a>,
+    repository: &'a mut Repository<'a>,
 }
 
 impl<'a> Engine<'a> {
-    pub fn new(source_path: &'a Path, repository: &'a Repository) -> Self {
+    pub fn new(source_path: &'a Path, repository: &'a mut Repository<'a>) -> Self {
         Engine { source_path, repository }
     }
 
-    pub fn backup(&self) -> Result<(), BakareError> {
+    pub fn backup(&mut self) -> Result<(), BakareError> {
         let walker = WalkDir::new(self.source_path);
         for maybe_entry in walker {
             let entry = maybe_entry?;
diff --git a/src/repository.rs b/src/repository.rs
index 59aa563..6b8b19e 100644
--- a/src/repository.rs
+++ b/src/repository.rs
@@ -25,7 +25,7 @@ pub struct Repository<'a> {
 #[derive(Clone)]
 pub struct RepositoryItem<'a> {
     version: ItemVersion<'a>,
-    relative_path: Rc<Path>,
+    relative_path: Box<Path>,
 }
 
 pub struct RepositoryIterator<'a> {
@@ -66,7 +66,7 @@ impl<'a> Repository<'a> {
             .into_iter()
             .map(|p| RepositoryItem {
                 version: ItemVersion(""),
-                relative_path: Rc::from(p.path()),
+                relative_path: Box::from(p.path()),
             })
             .collect();
 
@@ -89,25 +89,23 @@ impl<'a> Repository<'a> {
         }
     }
 
-    pub fn store(&self, source_path: &Path) -> Result<(), BakareError> {
-        // get file id -> contents hash + original path + time of taking notes
-        // get storage path for File
-        // store file contents
-        // remember File
-
+    pub fn store(&mut self, source_path: &Path) -> Result<(), BakareError> {
         let destination_path = self.path.join(source_path);
         if source_path.is_dir() {
             fs::create_dir(destination_path.clone())?;
         }
-        if source_path.is_file() {}
-
-        // TODO create new version, remember source_path
-
+        if source_path.is_file() {
+            // TODO: copy file
+            self.index.items.push(RepositoryItem {
+                version: ItemVersion(""),
+                relative_path: destination_path.into_boxed_path(),
+            });
+        }
         Ok(())
     }
 
     pub fn item(&self, path: &Path) -> Option<&RepositoryItem> {
-        None
+        self.index.items.iter().find(|i| *i.relative_path == *path)
     }
 
     pub fn newest_version_for(&self, item: RepositoryItem) -> ItemVersion {
diff --git a/tests/system_tests.rs b/tests/system_tests.rs
index b1d651a..7a06586 100644
--- a/tests/system_tests.rs
+++ b/tests/system_tests.rs
@@ -26,24 +26,34 @@ fn restore_backed_up_files() -> Result<(), BakareError> {
 fn restore_older_version_of_file() -> Result<(), BakareError> {
     let source = TempSource::new()?;
     let repository_path = tempdir()?.into_path();
-    let repository = Repository::open(repository_path.as_path())?;
-    let backup_engine = backup::Engine::new(source.path(), &repository);
+    let restore_repository = Repository::open(repository_path.as_path())?;
+
     let relative_path_text = "some path";
     let file_path = source.file_path(relative_path_text);
     let new_contents = "totally new contents";
     let restore_target = tempdir()?;
-    let restore_engine = restore::Engine::new(&repository, &restore_target.path());
+    let restore_engine = restore::Engine::new(&restore_repository, &restore_target.path());
     let old_contents = "some old contents";
 
-    source.write_text_to_file(relative_path_text, old_contents)?;
-    backup_engine.backup()?;
-    let file_id = repository.item(&file_path);
+    {
+        let mut backup_repository = Repository::open(repository_path.as_path())?;
+        let mut backup_engine = backup::Engine::new(source.path(), &mut backup_repository);
+        source.write_text_to_file(relative_path_text, old_contents)?;
+        backup_engine.backup()?;
+    }
+
+    let backup_repository = Repository::open(repository_path.as_path())?;
+    let file_id = backup_repository.item(&file_path);
     assert!(file_id.is_some());
     let file_id = file_id.unwrap();
     let old_version = file_id.version();
 
-    source.write_text_to_file(relative_path_text, new_contents)?;
-    backup_engine.backup()?;
+    {
+        let mut backup_repository = Repository::open(repository_path.as_path())?;
+        let mut backup_engine = backup::Engine::new(source.path(), &mut backup_repository);
+        source.write_text_to_file(relative_path_text, new_contents)?;
+        backup_engine.backup()?;
+    }
 
     restore_engine.restore_as_of_version(&file_id, old_version)?;
 
@@ -60,14 +70,18 @@ fn assert_target_file_contents(target: &Path, filename: &str, expected_contents:
 
 fn assert_same_after_restore(source_path: &Path) -> Result<(), BakareError> {
     let repository_path = tempdir()?.into_path();
-    let repository = Repository::open(repository_path.as_path())?;
-    let backup_engine = backup::Engine::new(source_path, &repository);
-    backup_engine.backup()?;
-
     let restore_target = tempdir()?;
-    let restore_engine = restore::Engine::new(&repository, &restore_target.path());
-    restore_engine.restore_all()?;
 
+    {
+        let mut backup_repository = Repository::open(repository_path.as_path())?;
+        let mut backup_engine = backup::Engine::new(source_path, &mut backup_repository);
+        backup_engine.backup()?;
+    }
+    {
+        let mut restore_repository = Repository::open(repository_path.as_path())?;
+        let restore_engine = restore::Engine::new(&mut restore_repository, &restore_target.path());
+        restore_engine.restore_all()?;
+    }
     let are_source_and_target_different = is_different(source_path, &restore_target.path()).unwrap();
     assert!(!are_source_and_target_different);
     Ok(())