I have about half a terabyte of media, including some original music I made a long time ago and lost the project files for. Backups are great but it will just back of the corrupted versions
Either way, bitrot or raid issues, a tool like this is interesting to me. I'd love something that watched my collection, stored the hashes, and altered me when they had changed (I know that's not what this tool does). I'm not sure I'd be willing to give up the space for something like par2 files but even a heads up other than "Oh, this isn't playing" would be nice.
So far all of the errors have been in files I could re-rip or recover from public sources, but I'm dreading finding an error in a file that's hard to replace. I'm cataloging those separately as I go along, and planning to do a full mirror in cloud storage.