"This tool will generate one parity file (plus a file for the recovery blocks) per file that you protect."

Maybe I used it differently: I'd have a collection of dozens or hundreds of files, and if some small portion of those files were missing or corrupt, the recovery would draw on the overall parity files.

With this tool, I might be misreading, but I think if a single file went missing, the recovery files would only be for that single file, so recovery would be impossible.