http://www.v-front.de/2013/11/testing-veeam-v7-tape-support-with.html describes testing Veeam Backup & Replication 7.0 product with tape devices. In version 7.0 of the popular data protection software for virtual environments, support for tape based backup including virtual tape libraries has been added. The article goes into detail the steps involved in configuring physical storage for virtual cartridges, creating VTLs, accessing the VTL devices using the Windows server iscsi initiator and performing backups and restores using Veeam