I use snapraid as one of my backup methods. Mainly for long term mostly static archive backups. Things that no longer change, but is added to, and I still want to have accessible read-only. Not for daily backups or for frequently changing files or folders, nor for "permanent" off-line cold storage.
I use 8 storage drives and two snapraid parity drives.
Using snapraid I can then easily verify that all backed up files are 100% OK, exactly as they were when I had just backed them up.
Snapraid can detect and fix bitrot (has never happened so far), undelete accidentally deleted files or folders and even recreate up to two failed drives.
When I backup/archive files, I simply copy them to one of the storage drives and then ask snapraid to update the parity.
Done!