made backup script more resilient to failure

backup.fish

@@ -26,6 +26,7 @@ end
 mkdir $LUKS_MOUNT
 sudo cryptsetup open --type luks $LUKS_DEVICE $LUKS_NAME
 sudo mount /dev/mapper/$LUKS_NAME $LUKS_MOUNT
+echo "$LUKS_NAME" > .luks-device
 "
 
 if test "$argv" = '--browse'
@@ -40,7 +41,7 @@ else
     echo "Syncing filesystem..."
     set_color normal
 
-    rsync --exclude-from=$RSYNC_IGNORE_FILE -rlptgozE ~ $USER@$REMOTE:$REMOTE_PATH #TODO find more applicable options 
+    rsync --exclude-from=$RSYNC_IGNORE_FILE -rlptgozEv --delete ~ $USER@$REMOTE:$REMOTE_PATH #TODO find more applicable options 
 
 end
 
@@ -48,8 +49,10 @@ end
 set_color -o green
 echo "Syncing complete - unmounting luks container..."
 set_color normal
+read -P "Continue? Just press enter to start unmounting! "
 ssh -t -i $KEY $USER@$REMOTE "
 sudo umount $LUKS_MOUNT
-sudo cryptsetup close --type luks $LUKS_NAME
+sudo cryptsetup close --type luks (cat .luks-device)
 rmdir $LUKS_MOUNT
+rm .luks-device
 "