Are there any filesystems with builtin data repairing via checksums?

I've read that ZFS/BtrFS have a checksum check, but they don't use it for data recovery, only for recovering data from a full local copy or a mirror copy. On the other hand, RAR archives support data redundancy for a long time, with a configurable amount. The more the amount, the higher is the probability of a successful recovery. Same for Dvdisaster which is able to create .ecc files with recovery data, yet on a separate medium. Many advanced media, like optical disks or hard disks, have a low-level ECC check implemented in a drive controller, so it's not that needed on higher levels of abstraction. But other ones, like cheap microSD cards, may lack it and are perceivably unreliable. So, there are ECC checks on hardware level and application level, but are there any ECC-backed filesystems?