[chmod775]

Backup plan? You are missing the point. If you need a backup you already messed up. The only entities that should need backups of anything but treasured photos are businesses.

If you don't bank on the assumption that you will always have access to some random mail account and instead treat it like a discardable glove, you don't need a backup plan.

Lost access to your mail account and forgot your PW to to some random other account? Whatever. Make a new account, tell your friends. Happens all the time.