[[!comment format=mdwn
 username="joey"
 subject="""comment 1"""
 date="2019-12-25T19:44:29Z"
 content="""
An admin might expect to be able to `mv passwd- passwd` to undo the most
recent change, and if so that might as well be supported after restoring
/etc from backup.

There is essentially no overhead in adding these files since they have the
same content as an older commit of the passwd file.
"""]]
