Veem Backup job very very slow

hi guys

One of back up job running really slow with veeam backup & replication.

Backup job details as below

Off-host backup (automatic proxy selection)

Enable application -ware image processing

Enable guest file system indexing

Back up mode is reversed incremental

Back up to NAS via network

Network connection via Gigabit switch/port

Speed only 5 MB

Bottleneck say on Target

How do I make backup job runs faster ?

I logged support call with veeam as well. But I hope some one in community give share there experience and advices as well

Thanks