If you are looking for specific IRD files, I can try to help you find them, or I can tell you more about the tools used for: Creating custom firmware (CFW) backups Fixing corrupted game dumps
Such archives (often found in ".rar" format) usually aim to cover the entire PS3 library, covering regional variations (US, EU, JP).
Correctly patched ISOs via IRD files work better with WebMAN MOD, IrisMAN, and multiman. Cons
Depending on the source, finding the specific IRD file (by Title ID) within thousands of files can be tedious.