What are the aliases or filters for in the Backup Utility Tool?
Aliases are used for email Forwarders, etc. The cPanel Alias Backup feature backs up your account settings for these aliases -- the fact that they exist and what they are -- NOT the entire contents of Forwarded email, etc. In other words, if you have an email Forwarder set up to forward email from email@example.com to firstname.lastname@example.org, that's a setting you've created. The cPanel Alias Backup will back up that setting information so you can restore the Forwarder setting at some later date if you have changed or lost it. It will not back up the actual contents, mail, or files of any email account.