Did you know that addons only save their data if you quit WoW normally? If WoW crashes, you have a power outage, or anything of that sort, any data from your latest play session is lost!
CrashProofer helps protect your addon data by backing it up to your other guild members who also use CrashProofer. That way when you log back in, they can send you back the data you would otherwise have lost!
As an added bonus, CrashProofer can be used to synchronize addon data between guild members, so you all have the same info!