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No ECC, absolutely worthless for a NAS if you care about your data.
This is FUD. If you run a redundant filesystem like btrfs or ZFS that does checksumming (which you should anyway in a NAS), then ECC memory is only a nice-to-have and not vital.
checksums at the filesystem level does nothing to protect against memory corruption which can overwrite everything on your disk with null values and a matching checksum; fail to write anything to disk and/or do nothing.
But that is the gamble you take every day with every GB of RAM you have.
Btrfs automatically switches to read only mode when it detects unrecoverable errors, which prevents severe memory issues from doing serious damage.
But your scenario is so unlikely that it borders on the impossible anyways.