Yeah, that does help, thanks. Funny you should mention not knowing anything about it, because I had the same thing happen. To make a long story short, I did a minor upgrade for a customer to correct some RFCed issues, and there we're problems with E-card afterward. As I know nothing about, I kind of started to panic. I didn't have the CD with the version of the customer had previously been on to "back date" them. Luckily, I backed up the bin directory, and was able to manually install their old version, and everything more or less fine (I think I did still have to do something to Ecard to get it to work again, but admittedly, I got lucky--could have been an even bigger headache). That's pretty much why I was asking--to find what needs to be done in the event that someone's file server fails (or some similar catastrophe), and it sounds like you'll end up needing to deal with Radiant if there is an issue.
The fact that they don't tell you how trouble shoot it or allow you to install it is weak. That's the whole point of the dealer network, is that the dealers get to make money on the service, etc. I also never liked that the fact that if your dealing with a chain that has over X amount of stores (I think it was 25 when Aloha Technologies was running the show--Blimpies, Tubby's, etc), that Aloha got the account. The dealers might get some action on the service if there was a problem that corporate couldn't handle remotely, but all the sales and service went to Aloha Technologies, even if there was a store right in your backyard (i.e. smack dab in the middle of your territory). In other words, "your an exclusive dealer licensed to sell our product, unless it is a big corporate account with lots of easy money to be made, then we want it". I wonder if Radiant has continued this process.