Using the multiple copy synthetic backups method
The multiple copy synthetic backups method introduces the capability to produce a second copy of a synthetic backup at a remote site as part of a normal synthetic backup job.
This method provides the following benefits:
It eliminates the bandwidth cost of copying synthetic full backups to another site.
Instead of duplicating a local synthetic full backup to a remote site to produce a second copy, it is more efficient to produce the second copy by using data movements only at the remote site.
It provides an efficient method to establish a dual-copy disaster recovery scheme for NetBackup backup images.
Table: Comparing synthetic copy process with and without method enabled emphasizes how the synthetic full backup produced at the remote site is a clone, or a second copy, of the first copy produced at the local site.
Table: Comparing synthetic copy process with and without method enabled
| Step | Without using the multiple copy synthetic backups method: | Using the multiple copy synthetic backups method: |
|---|---|---|
|
1 |
A full backup is performed at the local site (Site A). |
Step 1 remains the same. |
|
2 |
The full backup is duplicated to the remote site (Site B). |
Step 2 remains the same. |
|
3 |
An incremental backup is performed at Site A. |
Step 3 remains the same. |
|
4 |
The incremental backup is duplicated to Site B. |
Step 4 remains the same. |
|
5 |
Steps 3 and 4 are repeated each time an incremental schedule runs. |
Step 5 remains the same. |
|
6 |
A full synthetic backup is produced at Site A. |
Step 6 remains the same. |
|
7 |
The full backup is duplicated to Site B. |
A full synthetic backup is produced at Site B from images at Site B. The full synthetic backup at the remote site is a second copy of the synthetic backup at the local site. |
|
8 |
Steps 2 through 7 repeat per backup scheduling needs. |
Step 8 remains the same. |
Figure: Remote creation of synthetic full backup shows how no extra bandwidth is used to copy the synthetic full backup from Site A to Site B.
