[marcus0x62]

I use both to try to mitigate the risk of losing data due to a backup format/program bug[1]. If I wasn't worried about that, I'd probably go with Borg but only because my offsite backup provider can be made to enforce append-only backups with Borg, but not Restic, at least not that I could find.[2] Otherwise, I have not found one to be substantially better than the other in practice.

1 - some of my first experiences with backup failures were due to media problems -- this was back in the days when "backup" pretty much meant "pipe tar to tape" and while the backup format was simple, tape quality was pretty bad. These days, media -- tape or disk -- is much more reliable, but backup formats are much more complex, with encryption, data de-dup, etc. Therefore, I consider the backup format to be at least as much of a risk to me now as the media. So, anyway, I do two backups: the local one uses restic, the cloud backup uses borg.

2 - I use rsync.net, which I generally like a lot. I wrote up my experiences with append-only backups, including what I did to make them work with rsync.net here: https://marcusb.org/posts/ransomware-resistant-backups/