[Info-vax] BACKUP to the null device

[Bob Koehler]

In article <iis649$qvk$2 at online.de>, 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?

   Because /save_set is the default only for tape devices, while lack 
   of /save_set is only valid for disk devices.  NL: is not disk and
   not tape.

   You can put a save set on almost any device.  Using BACKUP in any
   other fashion requires the output be on a disk.