In that case, if putting back a folder to his original path make it to be deleted because of the read-only mode, the same thing have to be done for the deleted folder. For example with the same configuration which is: Device A and Device B are synchronized and Device B use a read-only secret. A folder in Device A is synced on Device B. Now I delete this folder from Device B. With the same reasoning, the folder have to be synced again in order for Device A to keep Device B in sync. But this is not the case ; I do it with every day and this is why I was surprised with this situation.