On Sunday, 18 February 2018 at 04:04:48 UTC, Jonathan Marler wrote: > If there is an existing standard that's great, I wasn't able to > find one. If you find one let me know. Found ptar (https://github.com/jtvaughan/ptar) and shar (https://linux.die.net/man/1/shar), both aren't too good fits, so indeed a custom format might be in order.