 
 BCK copies standard RMS-11 files from one medium to another
 (disk to disk or disk to tape), translating the data into a
 special back-up format.  The back-up copy contains the source
 file's attributes:  account number, creation and revision dates,
 protection code, and so on.  However, they do not include
 placement control instructions; a file cannot be restored to
 the same physical place on a device that it was backed up
 from.
 
 Back-up files can only be accessed properly by the RST utility
 (type HELP RST for more information).  User programs cannot
 change back-up data.
 
 BCK only uses magnetic tapes with ANSI-standard labels.  However,
 the back-up data written by the utility between the labels does
 not comply with ANSI standards.
 
 Type HELP BCK COMMAND for an explanation of BCK's command line
 and switches.
 
2 COMMAND
 
 The general BCK command line is:
 
	outfile[/switch(s)]=infile[/switch(s)][,infile[/switch(s)] ...]
 
 
 Switch		Type	   Description			Default
 
 ?		string	   Print HELP message		No help
 HELP
 
 /ID		Global	   Identify current version	No id
			   of BCK
 
 /QU		Global	   Enable Query mode		QU
 
 /SL[:file]	Global	   Provide summary listing (in	No summary
			   file, if specified)
 
 /RA		Outfile	   Read after writing		NORA
 
 /RC		Outfile	   Check after writing		NORC
 
 /RW		Outfile	   Rewind magtape before	NORW
			   writing
 
 /SU		Outfile	   Supercede old files		NOSU
 
 /CD:date[:v]	Infile	   Back-up files based on	No date checking
			   creation date
 
 /RD:date[:v]	Infile	   Back-up files based on	No date checking
			   revision date
 
 where	date = dd-mon-yy
	v    = None, created/revised on the specified date
	       A, created/revised after the specified date
	       B, created/revised after the specified date
