[Info-vax] BACKUP to the null device

[Phillip Helbig---undress to reply]

In article <iis9pe$1kj$1 at pcls6.std.com>, moroney at world.std.spaamtrap.com
(Michael Moroney) writes: 

> helbig at astro.multiCLOTHESvax.de (Phillip Helbig---undress to reply) writes:
> 
> >Whu does BACKUP to NL:FOO.BAR give the error %BACKUP-F-INVDEVTYP but to 
> >NL:FOO.BAR/SAVE_SET work?  If the error is correct in the first case, 
> >why doesn't it apply in the second, since in both cases the target is a 
> >file with the same device, directory, name, type and version?
> 
> That's because BACKUP would try to use the NULL device as a disk, 
> directories and all, and directories don't make much sense on the null 
> device.  Even in the simplest case (one file) it would want to make a
> directory entry for the copied file.
> 
> In the second case, it creates a saveset as a simple file, and I think it
> even uses RMS (except tapes).  It just throws data at a file.

OK, that sounds logical.