Backing up VMware virtual servers

I have a question, how many servers can you add under BE 2012?

We have a lot of VMware virtual servers that I would like to add the BE 2012 so that we can back them up to tape. The question is, is there a limit to the number of servers that you can add so that we can back them up to tape?

We have Symantec Backup Exec 2012 V14.0 Rev1798

Any information would be appreciated.