NAME [Toc] [Back]
backup - backup or archive file system
SYNOPSIS [Toc] [Back]
/usr/sbin/backup [-A] [-archive] [-fsck]
DESCRIPTION [Toc] [Back]
The backup command uses find(1) and cpio(1) to save a cpio archive of
all files that have been modified since the modification time of
/var/adm/archivedate on the default tape drive (/dev/update.src).
backup should be invoked periodically to ensure adequate file backup.
The -A option suppresses warning messages regarding optional access
control 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 -archive option causes backup to save all files, regardless of
their modification date, and then update /var/adm/archivedate using
backup 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 backup from cron(1M).
The -fsck option causes backup 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 fsck is running, especially if -fsck is allowed to automatically
fix whatever inconsistencies it finds. backup does not ensure that
the system is single-user.
You can edit /usr/sbin/backup to customize it for your system.
Several local values are used that can be customized:
BACKUPDIRS specifies which directories to back up recursively
(usually /, meaning all directories);
BACKUPLOG file name where start and finish times, block
counts, and error messages are logged;
ARCHIVE file name whose date is the date of the last
REMIND file name that is checked by /etc/profile to
remind the next person who logs in to change the
FSCKLOG file name where start and finish times and fsck
output is logged.
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You may want to make other changes, such as whether or not fsck does
automatic correction (according to its arguments), where cpio output
is directed, other information logging, etc.
In all cases, the output from backup is a normal cpio archive file (or
volume) which can be read using cpio with the c option.
File Recovery [Toc] [Back]
backup creates archive tapes with all files and directories specified
relative to the root directory. When recovering files from an archive
tape created by backup, 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 cpio, do not precede the leading directory name with a
slash. If you prefer, you can also use cpio with a -t option to
determine how files and directories are named on the archive tape
before attempting recovery.
WARNINGS [Toc] [Back]
Refer to WARNINGS in cpio(1).
When cpio runs out of tape, it sends an error to standard error and
demands a new special file name from /dev/tty.
To continue, rewind the tape, mount the new tape, type the name of the
new special file at the system console, and press Return.
If backup is being run unattended from cron(1M) and the tape runs out,
backup terminates, leaving the find process still waiting. Kill this
process when you return.
FILES [Toc] [Back]
/var/adm/archivedate parameterized file names
SEE ALSO [Toc] [Back]
cpio(1), find(1), touch(1), cron(1M), fbackup(1M), frecover(1M),
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