I have backup sets consisting of a full backup and eight incrementals. I go to the Manage Backups UI, select one of the sets, and choose Remove from the context menu. I get an error dialog saying "failed to remove the files, show log for details". However there is no log entry at all. When I look at the files I see the incrementals were removed but the full backup was not. I can delete the full backup file in Explorer without problem. This happens consistently.