About staging backups
In the staged backups process, NetBackup writes a backup to a storage unit and then duplicates it to a second storage unit. Eligible backups are deleted on the initial storage unit when space is needed for more backups.
This two-stage process allows a NetBackup environment to leverage the advantages of disk-based backups for recovery in the short term.
Staging also meets the following objectives:
Allows for faster restores from disk.
Allows the backups to run when tape drives are scarce.
Allows the data to be streamed to tape without image multiplexing.
NetBackup offers the following methods for staging backups.
Table: Methods for staging backups
| Staging method | Description |
|---|---|
|
Basic disk staging |
Basic disk staging consists of two stages. First, data is stored on the initial storage unit (disk staging storage unit). Then, per a configurable relocation schedule, data is copied to the final location. Having the images on the final destination storage unit frees the space on the disk staging storage unit as needed.
The following storage unit types are available for basic disk staging: BasicDisk and tape. |
|
Staging using the Storage Lifecycle Policies utility |
Staged backups that are configured within the Storage Lifecycle Policies utility also consist of two stages. Data on the staging storage unit is copied to a final destination. However, the data is not copied per a specific schedule. Instead, the administrator can configure the data to remain on the storage unit until either a fixed retention period is met, or until the disk needs additional space, or until the data is duplicated to the final location. No BasicDisk or disk staging storage unit can be used in an SLP.
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