backup(1M)							    backup(1M)

NAME
       backup - backup or archive file system

SYNOPSIS
       [-archive]

DESCRIPTION
       The  command  uses  find(1)  and cpio(1) to save a archive of all files
       that have been modified since the modification time of on  the  default
       tape  drive  should  be	invoked	 periodically  to ensure adequate file
       backup.

       The option suppresses warning messages regarding optional  access  con‐
       trol  list entries.  backup(1M) does not backup optional access control
       list entries in a file's access control list (see acl(5)).  Normally, a
       warning message is printed for each file having optional access control
       list entries.

       The option causes backup to save all files, regardless of their modifi‐
       cation date, and then update using touch(1).

       prompts	you  to mount a new tape and continue if there is no more room
       on the current tape.  Note that this prompting does not	occur  if  you
       are running from cron(1M).

       The  option  causes  to	start a file system consistency check (without
       correction) after the backup is complete.  For correct results,	it  is
       important  that the system be effectively single-user while is running,
       especially if is allowed to automatically fix whatever  inconsistencies
       it finds.  does not ensure that the system is single-user.

       You can edit to customize it for your system.  Several local values are
       used that can be customized:

	      specifies which directories to back up recursively (usually
			     meaning all directories);

	      file name where start and finish times, block counts, and	 error
	      messages
			     are logged;

	      file name whose date is the date of the last archive;

	      file name that is checked by
			     to	 remind	 the next person who logs in to change
			     the backup tape;

	      file name where start and finish times and
			     output is logged.

       You may want to make other changes, such as whether or not  does	 auto‐
       matic   correction  (according  to  its	arguments),  where  output  is
       directed, other information logging, etc.

       In all cases, the output from is a  normal  archive  file  (or  volume)
       which can be read using with the option.

   File Recovery
       creates archive tapes with all files and directories specified relative
       to the root directory.  When recovering files from an archive tape cre‐
       ated  by	 you should be in the root directory and specify the directory
       path names for recovered files relative	to  the	 root  directory  When
       specifying  the directory path name for file recovery by do not precede
       the leading directory name with a slash.	 If you prefer, you  can  also
       use  with  a option to determine how files and directories are named on
       the archive tape before attempting recovery.

WARNINGS
       Refer to in cpio(1).

       When runs out of tape, it sends an error to standard error and  demands
       a new special file name from

       To  continue, rewind the tape, mount the new tape, type the name of the
       new special file at the system console, and press

       If is being run unattended from cron(1M) and the tape runs out,	termi‐
       nates,  leaving	the process still waiting.  Kill this process when you
       return.

FILES
       parameterized file names

SEE ALSO
       cpio(1),	 find(1),  touch(1),  cron(1M),	  fbackup(1M),	 frecover(1M),
       fsck(1M), acl(5).

								    backup(1M)

Vote for polarhome