[Info-vax] BACKUP/BEFORE/BACKUP

[Phillip Helbig---undress to reply]

     When you use /BACKUP with /BEFORE, files with a BACKUP date prior
     to the specified date or time are selected. Files with no BACKUP
     date (that is, /RECORD was not specified when the file was saved
     or copied) are also selected.

That last sentence makes BACKUP behave differently than other commands, 
and differently than BACKUP with other qualifiers.  Though this feature 
is useful, why does it exist only in the combination above?