It's not "officially" supported, but iFixit has a guide for swapping the drive on a time capsule. I used mine with a 4TB drive for years with no trouble.
replySure, but still just a single drive.
replyMy old trusty readynas should still work i think.. probalby. Supports smd for time machine and smb3 generally. If it doesn't I might finally be pushed onto a nas that isn't discontinued.
I had an early ReadyNAS that was a champ for years. I wonder if the fact that it was based on SPARC had anything to do with its longevity.
replyFrom a risk assessment standpoint, I’ve seen my Time Machine backups corrupted much more frequently than I’ve experienced drive failure. Happened with both my Time Capsule and then my Synology RAID.
replyIt’s a “nice to have” automatic backup, but not a primary backup destination for me.