1. Yes.
2. Yes.
3. Can't think of any at the minute.
I keep all my accounts backed up on Dropbox regularly, personally, but I did almost lose them when I bought my new computer a few months back. Had to go and get the old hard drive out and retrieve the XML Launchpad file. Something like this would be a hell of a lot handier than doing the old 'export to ADF > drag to Skype' song and dance for sharing stuff, too.