Notifications will go a long way toward helping with that. Check all assumptions, check all exit codes, notify and stop if anything is amiss. I also have my backup script notify on success, with the time it took to back up and the size and delta size (versus the previous backup) of the resulting backup. 99% of errors get caught by the checks and I get a failure notification. But just in case something silently goes wrong, the size of the backup (too big or too small) is another obvious indicator that something went wrong.
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