I am actually doing this second-hand for my father, but that makes sense. Are those backups .nud format files? if so, I should be able to append .nud on them, keeping the 01, 02 etc. to differentiate them, but returning the association to .nud. If the association is not related to the extension, though, that likely won't work. But thank you for your help--I will report back on the resolution.

-John