I have a problem. Want to delete files of "tmb" time macjine backup. Relaunch finder and reboot nothing. Same error. "The operation can't be completed because backup items can't be modified." Can't delete. Want to free space so more room for backups in the future and renoved it from desktop so it won't bakcup anymore. But I can't delete it. I got 3tb hd for future. Just need to delete time machine some folders in the backup and can't. I can delete whole backups in control panel. But I don't want to rid of whole thing just few folders and keep the rest of the backup folder.