[otrs] How to delete old attachments?

Hi all. We have running OTRS for some month, and get a huge database. 762M DatabaseBackup.sql.gz This size do not adequate for backup reasons, but I know - 80% of it consists from an attachments (JPEGs, DOCs etc.). Wiil be great to delete old attachments from closed tickets 4 or more months ago. How i can do it? In genericagent i have only delete/not delete all ticket. -- Mike Lykov System Administrator, Domain Name Registrar REG.RU http://www.reg.ru/ +7 495 580-11-11 int. 504