Session / Restore files

Good morning!

I've searched and could not find this- could anyone please explain to me the files involved in oclhashcat sessions? Basically, I'm running a long-ass session using VCL, which is not the most reliable, and want to be able to back up my session every now and then.

So, if I wanted to take a snapshot of the running session, what would I need? Obviously the .restore file, but what else?

Thanks!