When registering a machine for backups, you have to select your service options with respect to backup retention and storage management. The options and explanations are listed below.

Tivoli Storage Manager backup policies for data retention will organize and back up data nightly for all registered machines. There are four retention levels from which to choose. When registering a machine for backups, you should elect one of the four retention levels as a default setting. The chart and definitions below define those retention levels.

• Versions data exist:  the number of copies to keep while maintaining the client data while on the client machine.
• Versions data deleted: the number of copies to maintain the client data after it is deleted from the client machine.
• Retain extra versions:  the number of days to retain inactive data.
• Retention only versions: the number of days to maintain the last version of the client data after it has been deleted from the client machine.

Data retention policies

Policy domain name	Mgmt class name	Versions data exist	Versions data deleted	Retain extra versions (days)	Retain only version (days)
DD0-OS-*	MC-DD0-OS-MAX	No limit	14	90	180
	MC-DD0-OS-MID	No limit	14	60	90
	MC-DD0-OS-LOW	No limit	No limit	30	30
	MC-DD0-OS-MIN	No limit	No limit	14	14
	MC-DD0-OS-SYS	No limit	No limit	14	14