I create a local backup of my hubs every 2 weeks, and I thought I might export all my rules to a single file, probably not really needed but I thought it might be handy to have. If I rule gets fubared and I want to start over I thought having a copy I can import would be easier than doing a full restore.
I have a lot of rules so doing this may not be possible, because it popped up an error when I tried. Status 408 on H2 request.
If there is a limitation then so be it, but if not, then it would be nice to have a Select all option, perhaps that is why there isn't one.