Obviously we don't want to get wiped out if somebody's house burns down. If you're developing some huge chunk of software, be sure to keep backups somewhere else. To aid this, I've set up the following scheme. Anybody who wants to back up something can simply write a disc with the name of the thing on it and the date, plus who sent it, and send it to me. I'll just keep the discs here in a special box for AI. When the box gets too full, I'll get in touch with you and see about scratching old backups for which I've received more recent copies. I'll recycle the old backups back as blank discs the next time somebody needs them.
There's no need to keep these backups very current. It's just good to know that we can't lose everything if a disaster happens.