Quantum vmPRO 4000 User's Guide download pdf (Page 158)

Chapter 4: vmPRO SmartMotion™ Backup

vmPRO SmartMotion Backup Policies

Quantum vmPRO User’s Guide 145

Figure106:Retention Schedule Example

Note:When you run a manual backup, it is treated like a daily backup for retention purposes. For

example, if you run a manual backup on a day when there is not a backup policy scheduled, the backup

is saved as a daily backup and the daily retention schedule is applied to it.

NAS Targets and Retention Schedules

When setting a retention schedule, consider the type of NAS target to which you are backing up data:

DeduplicatingNASTargets

DXi systems and deduplicating NAS targets generally achieve a 10:1 to 20:1 reduction in aggregate backup

volume, enabling greater retention periods than with comparably sized non-deduplicating storage devices.

Full and Differential/Changed Block Tracking (CBT) backups impact storage usage by approximately the

same amount as deduplication for the NAS target.

Non-DeduplicatingStorageTargets

Non-deduplicating NAS targets consume disk space more rapidly that their comparably sized deduplicating

counterparts. Full and Differential/CBT backups impact these storage targets differently. CBT backups

generally reduce a backup by 15%-30%, depending on your environment.

Regardless of the type of NAS target, the biggest factor to consider in setting a retention schedule is the rate

at which the VMs generate unique data blocks. VMs generating more unique data blocks use more storage.

Until you can observe the capacity growth rate, we recommend setting a short retention schedule, retaining

data for only 7 to 14 days.

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Quantum vmPRO 4000 User's Guide Page 158