> Emailed them, they promptly added 100 GB storage for a day so that I could recover the situation

Sorry to hear about your troubles. Hope your backup situation's sorted out?

Do you recall if you used a link like this to sign up?

https://www.rsync.net/signup/order.html?code=experts

If you don't, a good heuristic would be to see how much you pay per GB - if it's less than a cent, you probably did. The ones that come with support are typically a shade above per a cent per GB