Backup(1)Backup(1)NAMEBackup - backup the specified file or directory
SYNOPSISBackup [ -h hostname ] [ -i ] [ -t tapedevice ]
[ directory_name | file_name ]
DESCRIPTION
The Backup command archives the named file or directory (the current
directory if none is specified) to the local or remote tape device. It
can be used to make a full system backup by specifying the directory name
as /.
In case of a full backup, this command makes a list of the files in the
disk volume header and saves this information in a file which is then
stored on tape. This file is used during crash recovery to restore a
damaged volume header. Information about mounted filesystems and logical
volumes is also copied to the backup. The current date is saved in the
file /etc/lastbackup.
Full system backups can be used with the system recovery mechanism from
the PROM maintenance mode (the miniroot is booted with mode 3 in the
normal way, but recovery is started, instead of installation). See your
Owner's Manual for more information on this procedure.
The options and arguments to Backup are:
-h hostname If a tape drive attached to a remote host is used for
backup, specify the name of the remote host with the -h
hostname option. For remote backup to successfully work,
you should have a TCP/IP network connection to the remote
host and guest login privileges on that host.
-i If a backup of all files modified since the date
specified in the /etc/lastbackup file is desired, specify
the -i option. This option is valid only when doing a
complete backup.
-t tapedevice If the local or remote tape device is pointed to by a
device file other than /dev/tape, specify the device with
the -t tapedevice option.
directory_name Create a backup of the directory directory_name. For
this case, when files are restored, they will be restored
in the root directory, with the leading directory_name
stripped off.
file_name Create a backup of the file file_name.
The Backup command uses cpio(1) to perform the backup function. Older
versions used bru(1), or tar(1). The Restore(1) command will handle any
of the 3 types of backups.
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Backup(1)Backup(1)FILES
/tmp/volhdrlist contains the list of the root volume header files
/etc/lastbackup contains the date of last full backup for incremental
backups; the modification time of this file is used
NOTEBackup constructs a list of file names with find to pipe to cpio.
Filenames with embedded white space will work this way, with the
exception of filenames with embedded newlines, since each filename in the
list is terminated by a newline. This may sometimes produce confusing
error messages.
The exit status is 0 on success (including the case where no files are
backed up, but no errors with the tape drive or command occur).
SEE ALSOList_tape(1), Restore(1), cpio(1).
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