What's the difference?
A backup refers to a copy of your data that can be used to restore your original data at a later date in the event of loss or damage. The original data is retained after a backup is made.
An archive is a collection of historical data created for reference purposes, often to comply with regulatory requirements for data retention. Although not required, the original data is often deleted after an archive is made.
To determine which is needed, you often have to answer the following questions:
1. What vertical market sector do you do business in?
2. What kind of data do you want to protect?
3. What situations are you trying to protect against?