I just back up my carts regularly.
This was always my main problem, before there were no USB carts and backing up meant having a computer ancient enough to both have a parallel port and a shitty operating system that would run the even shittier software bundled with the cartridge reader you had chosen. So frequent backups were out of teh question..
I was on tour for all 2008 and back up was not an option, so I lost a ton of shit after a battery death in Sheffield. There were some good tunes there