I am assuming that you mean when you create the client for backup. Well the only fields that you have to fill in are the client name, and saveset. Everything eles is not required to get that client backed up unless you are doing something specific for that client.
You can also change the browse, retention, and directives. The fields like backup commcand, remote access, etc... are used but not for basic backup and recovery if you have a particular question about a specific field post it here.