Archiving, especially disk based archiving allows you to move data from primary storage as it ages and is less frequently accessed. This is because the access time to recover that archived data is still near instant, especially when compared to tape or optical, even though it is in an archive state. Archiving reduces primary storage costs similar to deduplication or compression, but how does it increase efficiency? Instead of putting more data into the same place, archiving moves this data out of the way and out of direct management by the IT Administrator.”]
Source: https://www.darkreading.com/database-security/archiving-your-way-to-efficiency