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The effect and result of HyperFactor processing is a factoring ratio . In simple words, the factoring ratio is the ratio of nominal data (as a sum of all user data backed up) to the occupied physical storage in ProtecTIER repository. 

Two key elements affect your factoring ratio and the effectiveness of your ProtecTIER environments: 

Data retention period 

Data change rate 

The period, which is measured in days, for which the backup application keeps the data available in its disk or tape repository. Typical retention periods of user data and applications are not longer than 90 days. Typical retention periods for database backups are not longer than 30 days, but specific weekly or monthly snapshots can be stored for months or even years. 

Tip:  A longer retention period increases the factoring ratio of your ProtecTIER product. 

The average percentage of data that is received from the backup application that changed from the previous backup iteration. This parameter is important when you size the backup repository and planning for optimal backup windows of various applications or systems. 

Examples of typical applications to be sized are progressive forever incremental backups and online database backups (IBM Lotusfi, IBM Dominofi, Oracle, SAP, IBM DB2fi, Microsoft SQL, MaxDB, and so on). The data change rate might vary from platform to platform (from 1% to greater than 25%). 

Tip:  Less changing of data improves the deduplication process and boosts the factoring ratio. 

