I also make checksums for every file and verify twice a year. Over millions of files totalling 450TB I end up getting about 1 failed checksum every 2 years. I

I also make checksums for every file and verify twice a year. Over millions of files totalling 450TB I end up getting about 1 failed checksum every 2 years. If you are having more frequent checksum failures I would check for RAM errors first. zfs and btrfs would do this automatically and have built in data scrub commands.