SLP's - incremental backups are size of full backups while doing to tapes

[1501SV]

I implemented SLP's to push my backups on disk to tapes. but surprisingly, my incremental backups are also of equal size to full backups and running into many TB's which is turning as a concern

any suggestions here will help me to reduce on the tape utilizations

here is nbstlutil report o/p 

Backlog of incomplete SLP Copies
        In Process (Storage Lifecycle State: 2):
                Number of copies:       1239
                Total expected size     151536045 MB

SLP Name: (state)                                 Number of copies: Size:
SLP_Daily_NBK02_TLD1 (active)                                911    88910657 MB
SLP_Daily_NBK04_TLD1 (active)                                313    50905427 MB
SLP_Weekly_NBK02_TLD1 (active)                                13     5058928 MB
SLP_Weekly_NBK04_TLD1 (active)                                 2     6661032 MB

Total:                                                      1239   151536044 MB

let me know if any more details required from my end

thank you

[RonCaplinger]

Incremental backups of VM's using NBU Accelerator that are duplicated from disk to tape will essentially be fulls, but I can't tell from your info above if that applies.
 

[1501SV]

thanks ron.

yes we are using accelerator in the environment which might be the issue here.

Do you have any reference of technotes or document highlighting this issue

[RonCaplinger · Accepted solution]

From this thread:
https://www-secure.symantec.com/connect/forums/duplication-incrementals-msdp-tape

...

"https://www-secure.symantec.com/connect/blogs/netbackup-accelerator-vmware-whole-new-world

"Accelerator VMware backups will support MS SharePoint, MS SQL and Exchange Full schedule only, no Incremental or Differential."

"Similarly to file system Accelerator backup, supported since NBU 7.5, the Accelerator backup for VMware will generate a Full image on the storage server using blocks from previous image (Synthetic backups). Only the blocks that have changed are transferred from client to media server."

Note StefanosM's post:

"BE AWARE THAT THE FOOTPRINT OF THE INCREMENTAL BACKUP IS A FULL BACKUP.

For SQL and exchange systems this is ok as they are always full. And for all of you that do not use tapes accelerator is ok.

BUT if you are duplicating your incremental backups to tape, then VMware accelerator backup is NOT for you."