3-2-1 analogy is old. We have infinite flexibility on where we can put data unlike before cloud servers existed.
I'd at least have file system snapshots locally for easy recovery in case of manual mistakes, have it copied at a remote location using implementation A and let it snapshot there too, copy same amount on another location using implementation B and let it snapshot there too, so not only you'd have durability, implementation bugs on a backup process can also be mitigated.
zfs is a godsend for this and I use Borg as secondary implementation, which seems enough for almost any disasters.
I'd at least have file system snapshots locally for easy recovery in case of manual mistakes, have it copied at a remote location using implementation A and let it snapshot there too, copy same amount on another location using implementation B and let it snapshot there too, so not only you'd have durability, implementation bugs on a backup process can also be mitigated.
zfs is a godsend for this and I use Borg as secondary implementation, which seems enough for almost any disasters.