Originally Posted by
Asturias56
" the alternating backups go to different types of media"
Can I ask why? Do you think that every SSD (for example) is suddenly going to fail?
It's possible that, if you bought two identical SSDs at the same time, you'd hit wear life on both of them at the same time.
Been caught out like that with large spinning rust RAID5 arrays; if you buy 30 discs at the same time the tolerances are such that when they start to fail the second one to fail is within the rebuild time from when the first one went.
In the OP's case I'd just sign up with Backblaze and not worry about it.