The RAR format and its various revisions.
The early version can still be opened nowadays, bypassing many scanners.

@Ange .RAR is effin fascinatin.

I really dig that (at least recent) versions kind of act similar to a RAID insomuch as parts can be lost, and the archive still recovered.

I am not aware of other compression formats which share such properties, but it seems like a really neat evolution in response to lost NNTP/NZB parts and such.

As usual: awesome diagram and break down!