diff --git a/mobile/app/index.tsx b/mobile/app/index.tsx
index 581c659..d1e5e21 100644
--- a/mobile/app/index.tsx
+++ b/mobile/app/index.tsx
@@ -1,7 +1,18 @@
 import { StatusBar } from 'expo-status-bar';
 import { StyleSheet, Text, View } from 'react-native';
+import { pickDirectory } from '../services/safDirectory';
+import { useEffect } from 'react';
+import { saveDirectory } from '../services/localStorage';
 
 export default function Index() {
+
+  useEffect(()=>{
+    pickDirectory().then((value) => {
+      if ( !value ) return;
+      saveDirectory(value)
+    })
+  },[])
+
   return (
     <View style={styles.container}>
       <Text style={styles.title}>Dot.</Text>
diff --git a/mobile/context/AuthContext.tsx b/mobile/context/AuthContext.tsx
index ea8b51a..9431cf6 100644
--- a/mobile/context/AuthContext.tsx
+++ b/mobile/context/AuthContext.tsx
@@ -1,5 +1,6 @@
-import { createContext, useCallback, useContext, useMemo, useState } from 'react';
+import { createContext, useCallback, useContext, useEffect, useMemo, useState } from 'react';
 import type { ReactNode } from 'react';
+import { useSyncDevice } from '../features/syncDevice';
 
 export type User = {
 };
@@ -11,6 +12,11 @@ type AuthContextValue = {
 const AuthContext = createContext<AuthContextValue | null>(null);
 
 export function AuthProvider({ children }: { children: ReactNode }) {
+
+  useEffect(()=>{
+    const {} = useSyncDevice()
+  },[])
+
   const [user, setUser] = useState<User | null>(null);
 
   const value = useMemo(() => ({ user }), [user]);
diff --git a/mobile/features/syncDevice.ts b/mobile/features/syncDevice.ts
new file mode 100644
index 0000000..2699430
--- /dev/null
+++ b/mobile/features/syncDevice.ts
@@ -0,0 +1,47 @@
+import { getUserPreferences } from "../services/localStorage";
+import type { UserPreferences } from "../services/localStorage"
+
+let syncStartedAt: null | number = null;
+
+export async function useSyncDevice() {
+
+    initialize()
+
+    async function initialize() {
+        
+        if ( syncStartedAt ) return;
+
+        syncStartedAt = Date.UTC(Date.now());
+
+        while (true) {
+
+            await sync()
+
+            await new Promise((resolve)=>{
+                setTimeout(() => {
+                    resolve(true)
+                }, 1000);
+            })
+        }
+ 
+    }
+
+    async function sync() {
+
+        console.info("Sync started")
+
+        const userPreferences = await getUserPreferences()
+
+        console.log(userPreferences)
+
+    }
+ 
+    async function setSyncMode( mode: UserPreferences ) {
+
+    }
+
+    return {
+
+    }
+
+}
\ No newline at end of file
diff --git a/mobile/services/distantStorage.ts b/mobile/services/distantStorage.ts
new file mode 100644
index 0000000..e69de29
diff --git a/mobile/services/localStorage.ts b/mobile/services/localStorage.ts
new file mode 100644
index 0000000..42a5eba
--- /dev/null
+++ b/mobile/services/localStorage.ts
@@ -0,0 +1,42 @@
+import { Folder } from "./safDirectory"
+
+const folders = new Map<Folder['uri'],FolderContext>();
+
+type FolderContext = {
+    syncStatus: 'local' | 'cloud' | 'local-cloud'
+    addedAt: number // UTC DATE
+    folder: Folder
+}
+
+export async function saveDirectory(folder: Folder): Promise<boolean> {
+
+    const ctx = {
+        syncStatus: 'local',
+        addedAt: Date.UTC(Date.now()),
+        folder: folder,
+    } satisfies FolderContext;
+
+    folders.set(folder.uri,ctx)
+    
+    return new Promise(()=> true)
+}
+
+export async function getFolders(): Promise<FolderContext[]>{
+    
+    return new Promise(()=> folders.values()) 
+
+}
+
+export type UserPreferences = {
+    syncMode: 'full' | 'manual' | 'none'
+}
+
+export async function getUserPreferences(): Promise<UserPreferences> {
+
+    return new Promise(()=>{
+        return {
+            syncMode: 'full'
+        } satisfies UserPreferences
+    });
+
+}
\ No newline at end of file