In this third segment on reducing backup windows, the focus will be on getting rid of the data that no longer needs to be backed up. In most cases, 99% of the time you should be using your backups to recover the most recent copy of something; a deleted file or corrupted database should be in the archive. Tape, Optical, or Disk can be the ideal target for long-term archives and cause a significant and near-permanent reduction in the backup window. The next entry will examine the disk-based archive concept to see if it can overcome challenges.”]
Source: https://www.darkreading.com/database-security/reducing-backup-windows-part-iii