To clarify, I don't know if I need a mirror or not. It was necessary in our 
previous strategy in case our primary NAS failed (and of course it did :)). 
With the Snap Server our backup data was useless because we could not restore 
it to be usuable on the backup NAS device.

In the Linux strategy, it may not be necessary depending on the way the data is 
accessible in the backup. I don't know enough about Amanda to tell you if we 
still need a mirror or not. Though I suspect it will make life easier.

The way I see it, the mirror is used if the whole NAS drive becomes unusable 
and the backups are used to restore a single folder or file.

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