Backup and restore tahoelafs to usb

src/freedombone-app-tahoelafs

 }
 
 function backup_local_tahoelafs {
-    echo -n ''
-    # TODO
+    source_directory=/home/tahoelafs/.tahoe-introducer
+    if [ ! -d $source_directory ]; then
+        return
+    fi
+    systemctl stop tahoelafs
+    dest_directory=tahoelafs
+    function_check backup_directory_to_usb
+    backup_directory_to_usb $source_directory $dest_directory
+    echo $"Backup to $dest_directory complete"
+    systemctl start tahoelafs
 }
 
 function restore_local_tahoelafs {
-    echo -n ''
-    # TODO
+    echo $"Restoring Tahoe-LAFS introducer"
+    systemctl stop tahoelafs
+    temp_restore_dir=/root/temptahoelafs
+    restore_directory_from_usb $temp_restore_dir tahoelafs
+    rm -rf /home/tahoelafs/.tahoe-introducer
+    cp -r $temp_restore_dir/home/tahoelafs/.tahoe-introducer /home/tahoelafs/
+    chown -R tahoelafs:tahoelafs /home/tahoelafs
+    systemctl start tahoelafs
 }
 
 function backup_remote_tahoelafs {