Evault 10.0.3 Backup with netbackup 7.5

Evault 10.0.3 Backup with netbackup 7.5

we have configured Evault backup using evault agent

We done it as per document it is working .

But the backed up data size is showing  lvery less as compared to orginal size of the archived data.

need some explanation

Thanks in advance.

Regards,