The best advice I could offer is what every webmaster learns from a situation such as yours (myself included)...make your own backups! While your web host (not only TCH, but others) might have backups, if it's really critical, at times like this, you are your own best friend!
The TCH guru's might be able to get something from a past server back up. If not, see if you might have some residual work left over on your computer. That way, you won't have to rebuild it all from scratch.