[lukestevens]

I've used Time Machine for years with a cheap HD hanging off an old Airport Extreme, until today, incidentally.

MacOS had started warning that this approach won't be supported in the future. After upgrading to Tahoe, Time Machine kept saying backup failed, no matter what I did, despite the fact it should still work. Oh well, I'll just delete the old backup and create a new one.

I delete the old backup, click "Add Backup Disk...", select the backup disk, and get blocked with "[Drive] can only be used if it contains existing Time Machine backups for this Mac." It did! You broke them!

UGH.

I thought I'd get another year out of it. Apple in their wisdom has decided otherwise. Now I have no historical or ongoing backups.

Any recs on what to use instead?

[setopt]

Arq Backup works great on Mac. It has a lot of smart features like only backing up on certain networks, only backing up when external power is connected, etc. You can backup either locally or remote (encrypted then uploaded to your preferred cloud provider, I used BackBlaze B2).

If you prefer free and open source, you can try Vorta (based on Borg Backup which I can also vouch for).

[lukestevens]

Thanks, I'll check out Arq! I use BackBlaze's backup service too, but want something local.

[dsego]

Carbon Copy Cloner.

[zikduruqe]

There's always rsync or rclone, and cron.