During the roll-up of a backup account on the StorageServer, the following error is seen in the Management Console and StorageServer log:
Unable to perform a roll-up since some required files have not been mirrored yet.
This error message is misleading because the error does not happen due to files not being mirrored. Normally, this only occurs on a MirrorServer when some files have not been mirrored. However, if there is a situation on a StorageServer where the data index contains a reference to a file that does not exist on disk, the same error message will be displayed.
Run a Quick Integrity Check with fixes on the StorageServer backup account.