I use Backblaze B2 for one offsite backup in “the cloud” and have two local HDDs. Using restic with rclone as storage interface, the whole thing is pretty easy.

A cronjob makes daily backups to B2, and once per month I copy the most current snapshot from B2 to my two local HDDs.

I have one planned improvement: Since my server needs programmatic access to B2, malware on it could wipe both the server and B2, leaving me with the potentially one-month old local backups. Therefore I want to run a Raspberry Pi at my parents’ place that mirrors the B2 repository daily but is basically air-gapped from the server. Should the B2 repository be wiped, the Raspberry Pi would still retain its snapshots.

See, they want you to believe that SQL stands for Structured Query Language. But I know from our lord and savior Elon that it actually means Socialist Queer Liberals!