Hmm does that User have a sql db backup, him/her/it-self ?
( Is it DB for website , or DB sql for user parts as mail and more for Directadmin administration) ?
VERSIONS all software used?
I can't help further but if some they need versions , if it is A DATABase used for Website or other Aplication for that User, be quick and ask if some ore they have bakups somewhere before they are deleted to!