Is there a way to change the account used to backup up a server on the sub client level without reinstalling the agent?
Which IDA are you trying to change the account for?
Its a windows agent and a Linux agent.
Where exactly are you looking to change it? For the windows agent for example?
If it is a filesystem backups - default uses local windows account
Local services for the file system portion, any application backup like AD, Exchange MB\DB etc should have a credentials setting in the specific IDA properties.
Cnat see them in V11? can you still change them?
Change the account for what portion of the installation? The services themselves themselves run on the local user account. In Windows this can be modified by adjusting the users for the CV services under services.msc.