I am reconnecting a second NAS and want to update the map structure to be similar to the currently used NAS. Some of the maps will reused. They contain files up to last year. But I guess some in the old NAS may have been deleted or replaced. The old NAS have .sync and .SyncArchive folders, which I guess contain old information that may disturb the sync function. Should they be deleted before I reconnect and let BT sync do the restoration from scratch?