Setting account backup order or priority

As an admin, I would like to be able to set the order or priority in which the backup script checks the accounts to back up, so that I can make sure my largest or highest-priority accounts are processed first during low load.

It looks like the backup script calls a function to get the list of accounts, which may end up looking up cached versions of /etc/domainusers, /etc/truedomainusers, etc, and those cached files frequently change the order that the accounts are listed in. That means that the order in which backup processes the accounts will also change. I'm not sure what criteria are used to sort the accounts in the cached files.