I don't bother.
A fire (or flood or theft or...?) threat might take out both of my local copies. To offset that risk, I put a lot of effort into making sure the offsite copy is always functional, up-to-date, and healthy (S.M.A.R.T and otherwise).
I've been considering keeping a fourth copy of extra extremely crucial data encrypted on Backblaze B2, but honestly...if I lose my whole 3-2-1 stack, it's probably time to go live as a goat.
Same exact scenario here. Hmm