I need to reinstall Windows (which will require reinstalling BT Sync) on a machine with a number of large BT Sync shared folders.  The drive with the shared folders is not the same as the OS drive, so none of the data will be modified or deleted.  Can the new installation of BT Sync detect that the existing shared folders are up to date or will it have to completely re-sync all the data in those shared folders?  If there is a way to avoid re-syncing all the shared folders, is there anything I ne