show storage peformance in kb/s used by a particular user account

esx 5.5

I have aesx 5.5 withvirtualmachines.

Andaprogram makesbackupusing aspecificaccount xxx.

Is there a wayto see how muchkb/sis using thetaskperformed byaccontxxx

example:

if see grafic performance for esx1:

I have anaveragebandwidth usageondisk of 150Mb/s

if start backup with account xxx the usage disk up to  250Mb/s

butI'm not surethat   +100Mb/sare due tothe backup task launched byxxx or usage byvm  process

help me

thanks