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Maybe this is overkill, but I'm trying to provide some protection against having my backup drive getting hosed. I make a regular SD! backup to an external drive, backing up my entire drive (not the Sandbox). But, I had an experience once that when I needed to go to the backup, the drive wouldn't work, so there I was, with neither a working drive nor a working backup.
I have data backup redundancy by using Time Machine (to another drive...not the same one I back up to using SD!). I wanted to create some redundancy for my system and my apps as well, and keeping several 220GB whole drive backups takes a lot of room! So, I thought I could make smaller (around 40GB) "snapshots" of the system and apps by making a copy of my sandbox (assuming it's "shared users" only).
If there is a better strategy, I'm certainly all ears!
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