How to suppress errors and backup exceptions in Avamar Activity and enterprise manager

So you don't want to know about a certain error, or the administrator of that system is not helping you solve this backup problem ?

No problem, just do the following so it will not appear in your "failed" list:

Go to the AVAMAR_INSTALL_PATH\avs\var directory 
Create a file named avtar.cmd

Append the following in it (replace 30901 with the error code you want to suppress):

--downgrade-error-codes="30901"