I wonder if there is some sort of archiving software that is able to encode parity bits similar to how RAID5 works in order to help recovery in the event of corruption to part of the disk.
This is useful if you have a bunch of little files - you WinRAR them into a single file with recovery volumes, and then you can create a bunch of PAR2 files on top.
I'm not saying this is a sensible thing to do.