In continuition to the below thread, I tested TIR but it did not work as expected. I don't find any difference between TIR and non-TIR restores.
https://www-secure.symantec.com/connect/forums/collect-true-image-restore
Enabled "collect true image restore information " attribute for the policy. NetBackup version 7.5.0.5 and master is on Linux platform.
1. Created files test1 and test2 in the folder TEST and took a full backup
2. Added file A in backup target path, and then took incremental backup
3. Remove file A, and then took incremental backup
case 1 : Now in BUR, selected "Restore from Normal backup" by selecting the latest incr backup now the folder TEST had the same contents (test1, test2)
case 2: Again tested restore, by selecting "Restore from true image" from the latest incr backup and surprisingly found the same files in folder.
I could not figure out the difference.