Backing up however needs to be more than just mirroring the site. Lets say, for whatever reason, config.php is wiped out, or corrupted. The mirror server will just copy it, or delete it I suppose. Or a file gets hacked, it will get copied to the mirror.
By using incremental backups with hard linking, you can keep snapshots on the backup server to allow for rollbacks to certain times (hourly, daily, weekly, monthly)..
I guess what I am saying, is rsync alone is not all that helpful.
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