A slight digression:
My LaCie external drive, used for storage of Really Important Things Which In Practice I Will Never Look At Again, died this week - power on, light glows, drive doesn't turn.
I bought a Toshiba 32Gb USB thumb drive (€15.95), unplugged the dead LaCie, plugged in the USB drive, PC demanded a restart (don't know why but it did) after booting up again I looked at LaCie software which now says "save to Toshiba USB drive" - hit "backup" and away we went.
There appears to be a file on there with all e-mails saved......