Forum Discussion

psingh's avatar
psingh
Level 4
12 years ago

difference between synthetic backup/ optimised synthetic backup and virtual synthetic backup

Hi, As per my understanding synthetic backup takes one full backup and some incremental backup images and creates an image (synthetised image). virual synthetic backup just holds a pointer for al...
7.1.x and Earlier
Backing Up
Backup and Recovery
Linux
NetBackup
Symantec Supported Data Connectors
  • Mark_Solutions's avatar
    Mark_Solutions
    12 years ago

    Synthetic does create a whole new image

    Optmised Synthetic is done using de-dupe pointers

    Virtual Synthetic is not generally a NetBackup term but the priciple can be either of the above depending on which vendor is using the term

    So NetBackup has three type:

    1. Synthetic - done without network transfer and make a whole new image

    2. Optimnised Synthetic - done without network transfer and synthesises and new image but adding de-dupe pointers only

    3. NetBackup Accellerator - small amount of data transfer from the client and synthesises a full backup

Mark_Solutions's avatar
Mark_Solutions
Level 6
12 years ago

psingh - in simple terms yes - both methods are done without transferring data over the network from the client, the primary difference is that one creates a new full backup the other used de-dupe to create the pointers to a new full backup and so used no disk space on the storage other than a new set of references.

The newest version using NetBackup Accelerator does take data over the network but creates a full backup by combining the incremental changes it finds on the client with what is already stored in the de-dupe pool - so it only takes a fraction of the data over the network

Hope this all helps