| 1 | .TH BACKUP 8
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| 2 | .SH NAME
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| 3 | backup \- backup files
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| 4 | .SH SYNOPSIS
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| 5 | \fBbackup\fR [\fB\-djmnorstvz\fR] \fIdir1 dir2\fR
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| 6 | .br
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| 7 | .de FL
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| 8 | .TP
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| 9 | \\fB\\$1\\fR
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| 10 | \\$2
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| 11 | ..
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| 12 | .de EX
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| 13 | .TP 20
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| 14 | \\fB\\$1\\fR
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| 15 | # \\$2
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| 16 | ..
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| 17 | .SH OPTIONS
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| 18 | .FL "\-d" "At top level, only directories are backed up"
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| 19 | .FL "\-j" "Do not copy junk: \fI *.Z, *.bak, a.out, core\fR, etc"
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| 20 | .FL "\-m" "If device full, prompt for new diskette"
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| 21 | .FL "\-n" "Do not backup top-level directories"
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| 22 | .FL "\-o" "Do not copy \fI*.o\fR files"
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| 23 | .FL "\-r" "Restore files"
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| 24 | .FL "\-s" "Do not copy \fI*.s\fR files"
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| 25 | .FL "\-t" "Preserve creation times"
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| 26 | .FL "\-v" "Verbose; list files being backed up"
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| 27 | .FL "\-z" "Compress the files on the backup medium"
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| 28 | .SH EXAMPLES
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| 29 | .EX "backup \-mz . /f0" "Backup current directory compressed"
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| 30 | .EX "backup /bin /usr/bin" "Backup bin from RAM disk to hard disk"
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| 31 | .SH DESCRIPTION
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| 32 | .PP
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| 33 | \fIBackup\fR (recursively) backs up the contents of a given directory and its
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| 34 | subdirectories to another part of the file system.
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| 35 | It has two typical uses.
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| 36 | First, some portion of the file system can be backed up onto 1 or more
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| 37 | diskettes.
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| 38 | When a diskette fills up, the user is prompted for a new one.
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| 39 | The backups are in the form of mountable file systems.
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| 40 | Second, a directory on RAM disk can be backed up onto hard disk.
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| 41 | If the target directory is empty, the entire source directory is copied
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| 42 | there, optionally compressed to save space.
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| 43 | If the target directory is an old backup, only those files in the target
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| 44 | directory that are older than similar names in the source directory are
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| 45 | replaced.
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| 46 | \fIBackup\fR uses times for this purpose, like \fImake\fR.
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| 47 | Calling \fIBackup\fR as \fIRestore\fR is equivalent to using the -r option;
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| 48 | this replaces newer files in the target directory with older files from the
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| 49 | source directory, uncompressing them if necessary. The target directory
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| 50 | contents are thus returned to some previous state.
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| 51 | .SH "SEE ALSO"
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| 52 | .BR tar (1).
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