NAME
backup - backup files
SYNOPSIS
backup [-djmnorstvz] dir1 dir2
OPTIONS
-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
DESCRIPTION
Backup (recursively) backs up the contents of a given direc-
tory and its subdirectories to another part of the file sys-
tem. 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.
SEE ALSO
tar(1).