If you are worried like me about data degradation on your document/archive NAS it might be worthwhile looking into SnapRAID. SnapRAID is a backup solution for disk arrays. It creates hashes on a extra disk to ensure data integrity and gives you a additional recover option for the failed array disk. As an extra benefit you can recover specific files from accidental deletion and verify the current data set. I am using this mostly for the last option because it gives a extra layer of safety on those important files I don't want to see get corrupted without taking a 1 on 1 backup. Let's have a ...