Johnny Billquist wrote: 
  [Snip]
 I'm not aware if RT-11 also had some backup tool, but I would assume so. 
The name of the RT-11 backup utility file is BUP.SAV
and I assume that the file structure of the data files
which it produces is unique to RT-11.  As far as I can
remember, multiple files can be used when a large device
was being backed up to files on a smaller device.  The
output device can be either tape or disk.
However, from the DCL point of view, the command name is:
BACKUP
Jerome Fine