[CurlyMo]

1. I created the apt repo back then to support multiple versions. I still don't know the reason why older ones are removed...
2. Apt pulls the first mirror from the mirror.txt and if that one doesn't work checks the next.
3. You can always abort a reboot command. xbian-update gives you 1 minute to do so.
http://stackoverflow.com/questions/526329/possible-to-abort-shutdown-on-linux