How to 'import' backups written by EDM, EMC Data Manager, Legato, Ominiback, ArcServe, or other backup products using the NetBackup application.
http://support.veritas.com/docs/272912
While VERITAS NetBackup (tm) is able to 'import' media written by NetBackup or VERITAS Backup Exec (tm) products, there is no option to import other vendor written media.
One workaround to the issue is to restore the data using the other vendor software, then back up the data again using the NetBackup application.
I suggest you try posting to a Legato forum. Here is a link to a legato forum on tek-tips:
http://www.tek-tips.com/threadminder.cfm?pid=480