[Info-vax] BACKUP/BEFORE/BACKUP

[abrsvc]

On Feb 8, 2:36 pm, hel... at astro.multiCLOTHESvax.de (Phillip Helbig---
undress to reply) wrote:
>      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?

Typically a backup with the /before switch is to capture the state of
the disk at a certain time.  You have the qualifier mis-understood.
The /before qualifier has no relation to the backup date unless you
use the "=backup" specification.  The date specified by the /before is
the trigger date for qualifying files based upon their creation date.

The use of the /since=backup checks the modify date against the
recorded backup date and will select files that have NOT been saved or
have been modified since the previos backup.

Dan