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Minix/1.7.5/MANUALS/CAT0/BACKUP

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+Command:   backup - backup files
+Syntax:    backup [-djmnorstvz] dir1 dir2
+Flags:     -d  At top level, only directories are backed up
+           -j  Do not copy junk:  *.Z, *.bak, a.out, core, etc
+           -m  If device full, prompt for new diskette
+           -n  Do not backup top-level directories
+           -o  Do not copy *.o files
+           -r  Restore files
+           -s  Do not copy *.s files
+           -t  Preserve creation times
+           -v  Verbose; list files being backed up
+           -z  Compress the files on the backup medium
+Examples:  backup -mz . /f0         #    Backup    current     directory
+                                      compressed
+           backup /bin /usr/bin     # Backup bin from RAM disk  to  hard
+                                      disk
+
+     Backup (recursively) backs up the contents of a given directory and
+its  subdirectories  to  another  part  of  the file system.  It has two
+typical uses.  First, some portion of the file system can be  backed  up
+onto  1  or  more  diskettes.   When  a  diskette  fills up, the user is
+prompted for a new one.  The backups are in the form of  mountable  file
+systems.   Second,  a  directory  on RAM disk can be backed up onto hard
+disk.  If the target directory is empty, the entire source directory  is
+copied  there,  optionally  compressed  to  save  space.   If the target
+directory is an old backup, only those files  in  the  target  directory
+that  are older than similar names in the source directory are replaced.
+Backup uses times for  this  purpose,  like  make.   Calling  Backup  as
+Restore  is equivalent to using the -r option; this replaces newer files
+in the target directory with older  files  from  the  source  directory,
+uncompressing them if necessary.  The target directory contents are thus
+returned to some previous state.
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+                                                                        
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