Below a simple explanation of backyp versus archiving!
Organizations want archival storage products that provide authenticity, long-term retention of data and low total cost of ownership over time, without sacrificing the need for fast access and reliability. However, confusion often arises over the difference between backup and archival storage products and the specific technologies that address each need. Companies must first distinguish between their backup and archiving needs before choosing the appropriate storage solutions to meet those needs.
Essentially, a backup is designed as a short-term insurance policy to facilitate disaster recovery, while an archive is designed to provide ongoing rapid access to decades of business information. Archived records can be placed outside the traditional backup cycle for a long period of time, while backup operations protect active data that's changing on a frequent basis.
Performance is an important factor for backup, but since most backup operations involve large data sets, the ability to quickly stream information to and from the backup media is a first priority. Fast random access to small data sets during restore operations is typically less important. As an insurance policy, it is also necessary to minimize backup expense by reducing the cost of each stored record. The media of choice for backup and disaster recovery applications has traditionally been magnetic tape since it satisfies the performance and cost criteria of most organizations.
Archival storage requirements are quite different from those of backup operations. Media longevity and data authenticity feature much more prominently in archive environments. The storage media used within an archive should have a stable, long life to avoid frequent data migration over decades of storage. In order to comply with corporate and government regulations on data authenticity, it is crucial that information be protected from modification.