Connect another harddisk to your server, configure as backup disk (do not add the disk to the storage pool), then from the Computers and Backup Tab configure server backup. Please note server backup can (sadly) not be automated, so you manually need to run
backups regularly.
From your post it's not clear which account is actually used for deleting the files, and I have no personal experience with i-tunes. Could be system account or dedicated account for i-tunes. If you know which account is used to actually delete files you
could deny "delete subfolders and files" for this account; logon to the home server using remote desktop, open explorer window, navigate to D:\shares, right click appropriate share, select properties, then security tab, advanced, select appropriate user, click
edit. Please note this method is unsupported and you risk messing up your server when make any error.
Henk Panneman - http://www.homeserverweb.nl