Hey, lukin. Did you review the User's Guide (Help > User's Guide)? Many of these questions are answered there (in the Introduction, "Backing up over a network" and "Recovering from a disaster").
If your only backup is to a NAS, you'd likely want to copy the image on the NAS to a local external drive should you need to do a full restore, or have a small drive that contains a full OS install (so you can get access to networking).
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--Dave Nanian
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