You don´t need access to ESXi, just need access to Universal server. you can log to web interface through this link http://hostname:9000
If you have access, you should update to Universal server 2.12 SP4.
You can get downloads from fileconnect.symantec.com , entering serial number of the product.
If file is not available, you should ask Customer care:
http://www.symantec.com/business/support/assistance_care.jsp
Once you are in 2.12 SP4, you can get a working backup , which you will restore to 3.0.2 .
Please note that latest and recommended version is Universal 3.2