Hello,
Backup Exec do not require "Administrator" account, but requires account who is a member of Domain Admin group.
As its SBS, I assume we are also backing up Exchange. For backing up exchange the BE Service account must be configured in the following manner:
1 : Member of the domain Admin Group
2 : Mailbox enabled account
3 : Mailbox NOT hidden from the global address list
4 : A unique account, first 5 digits must not contain "admin"
Whenever I configure BE service for backing up exchange, I create a new account named symantec in Active Directory and assign the above rights.
Backup Exec do not talk with Active Directory directly, so whenever we change the password for the BE service account we have to manually add the password in Backup Exec
hope this helps....