problem with running of "CretaeImageNow.PS1"

i am running this script  "./createImageNow.ps1 [UNCPATH] .

steps to tun the script :  "./createImageNow.ps1  //192.168.125.30/est2 .This command is run successfully but this script always take the backup of   c drive .

I want to change backup path from c drive to another drive.

Please help me to resolve the issue