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Description of problem:
Currently, the Postfix role has "postfix_backup" and "postfix_backup_multiple" variables available to control configuration file backups.  It is not clear how these options work and relate to each other (see also https://bugzilla.redhat.com/show_bug.cgi?id=1961858 regarding documentation).  

Does this role follow the same file backup methodology as our other roles?  If not, is there a reason we shouldn't have it be consistent with the other roles file backups?

If possible, all roles should have similar workflow for how config file backups are completed so that the user has a consistent experience between the different roles.

If there are special requirements or considerations for the Postfix role that justify having differences for file backups from other roles then we should keep these differences if needed.  

Version-Release number of selected component (if applicable):
rhel-system-roles-1.0.0-31.el8.noarch

After investigating the current behavior of the postfix role, it handles configuration backups the same way as other roles, by making a timestamped backup.  I am documenting this behavior in https://bugzilla.redhat.com/show_bug.cgi?id=1961858, so I am closing this bug.