Since there doesn't seem to be an electronic solution to your conundrum I'll suggest a mechanical one...
Why not go to a two TM backup solution similar to joemike's, but with a small HD that you'd swap out for a new one each January 1st for the second backup (as opposed to his RAID array)?
You'll then have an ongoing backup and a yearly archive to protect against the truncation of the ongoing one.
Last edited by artie505; 03/02/19 10:12 AM. Reason: Expand
