I'm currently doing borg backups to a local server, then using restic to back up my borg backups to B2. My reason for using restic over rclone is so that if the local backup is corrupted I've got history on the remote to fall back to.
I'm hoping to find a less cumbersome way to do this.
Some use-cases, like photo libraries, won't benefit much from compression, so I may use restic directly for those.
I'm sure there are ways to manage this though, I just haven't figured them out yet.
I've done borg for local backups for a while and figured I could just replace it with restic, then I discovered that restic doesn't do compression so I just pointed that at the borg repositories.
I'll probably use restic directly for things that don't benefit from compression and continue to use borg for things that do.
I'm open to better options though, layering two tools that basically do the same thing seems like a bit of a hack job.