I run snapraid once a night and it has a scrub feature to read every file and compare against the stored checksum. https://www.snapraid.it/manual https://www.s

I run snapraid once a night and it has a scrub feature to read every file and compare against the stored checksum. https://www.snapraid.it/manual https://www.snapraid.it/manual All my drives are Linux ext4 and I just run this program on every file in a for loop. It calculates a checksum and stores it along with a timestamp as extended attribute metadata. Run it again and it compares the values and reports if something changed. https://github.com/rfjakob/cshatag https://github.com/rfjakob/cshatag These days I would suggest people start with zfs or btrfs that has checksums and scrubbing built in. Over 400TB of data I get a single failed checksum about every 2 years. So I get a file name and that it failed but since I have 3 copies of every file I check the other 2 copies and overwrite the bad copy. This is after verifying that the hard drive SMART data shows no errors.