Thanks, that did it for me.
The .backup files are binary but only generated when using winbox it seems. The .rsc files are just what I wanted. 'compact' doesn't seem available on 4.11 however.
using expect/send and wget, I've got an automated backup running against a few routerboards.
Cheers!
If you're going to put it on another router, I would add the compact command in there as well.
/export file=backup-test compact