This PowerPoint presentation is from a Storage Decisions session (New York 2008) that explores how, although disk systems are cheaper than ever before, the use of disk in backup systems, including VTLs, has been very limited due to its cost. However, thousands of deduplication-based disk systems have now been deployed, and customers the world over are seeing that they can indeed take the place of tape for onsite backup storage. While many companies still copy these backups to tape for offsite storage, some companies have figured out ways to either stop shipping tapes or to stop using them altogether.