It's clear that for backup the author means, backup for disaster-recovery purposes. There is no other reason to backup a git repository, and the previous "Don't

It's clear that for backup the author means, backup for disaster-recovery purposes. There is no other reason to backup a git repository, and the previous "Don't Panic" section covers recovering from git fumbles. The mailing list thread he links to in the Backup section details a traditional off-site rsync backup.