Netbackup for EV restores take up twice as much "size on disk"

Netbackup 7.5.0.5   -   windows 2008 R2     -     EV9.0.3.1164

During restore of the Open Partitions, the restore takes up twice as much "size on disk" as related to the size of the data.

This repeatedly causes the restore to fail as it fills up the disk:

6/20/2013 10:12:58 AM - begin reading
6/20/2013 1:37:20 PM - Error bptm(pid=6216) cannot write data to socket, 10053    

6/20/2013 1:37:23 PM - Error bptm(pid=6216) more than 10 files were not restored, remaining ones are shown in the progress log.
6/20/2013 1:37:26 PM - Critical bpbrm(pid=13444) from client d0app69: FTL - socket read failed     
6/20/2013 1:37:26 PM - Info tar32(pid=736) done. status 23          
6/20/2013 1:37:26 PM - Info tar32(pid=736) done. status: 23    

Can someone help me to resolve this issue?