For data set backup, you need to consider the frequency of backup and the number of versions you want to keep. A number of factors can influence this decision, such as:

• The rate at which the data changes.
• The ease or difficulty of rebuilding the data (for example, it is easier to rebuild an object library than a source library).
• The importance of the data. For data that is extremely important to your business, you might want to keep extra backup versions.