You can look at rclone’s docs on how to hook that into B2 (or wherever you’d like to dump your backups, B2 is jusut cheap). I also set up a crypt in rclone so it encrypts it as it uploads (optional).
Then just put those on cron jobs at different times, I do them every 6 hours. One at <hour>:15 and one at <hour>:45
Then in B2 I set the bucket to keep files for 10 days.