Well they did say the old site still exists (though they probably changed the URL) so you could go in and get anything that didn't make the jump to the new forum.
I would not recommend bugging them about it right now though, as they seem to have a fairly full plate. I'm fairly certain they will tell us what the old site's new address is when they have everything hashed out.
Going forward, it is common wisdom that if your files do not exist in at least three places, they do not really exist. Always keep backups - on a computer, on a flash drive and online in a forum or cloud storage would work.