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I have a PC I'm using mostly for a NAS that runs Ubuntu 14.10 with SnapRaid. Its important to keep this data long-term, so I care about bit rot and that is the focus of my two questions:

1. Since I don't have EEC memory (motherboard doesn't support it), I don't have a ZFS file system. My justification for this is the data is written and not changed often, so bit rot on the HDD is much more likely and I'm looking into using SnapRaid's parity check for this. Is that faulty logic?

2. I backup to external HDDs. Is there a backup method that does additional verification that the file copied to the backup drive is correct, or if there is an issue with a file on the backup, overwrites it with the NAS version?

Thanks for your help.