53 lines
1.8 KiB
Groff
53 lines
1.8 KiB
Groff
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.TH BACKUP 8
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.SH NAME
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backup \- backup files
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.SH SYNOPSIS
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\fBbackup\fR [\fB\-djmnorstvz\fR] \fIdir1 dir2\fR
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.br
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.de FL
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.TP
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\\fB\\$1\\fR
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\\$2
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..
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.de EX
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.TP 20
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\\fB\\$1\\fR
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# \\$2
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..
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.SH OPTIONS
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.FL "\-d" "At top level, only directories are backed up"
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.FL "\-j" "Do not copy junk: \fI *.Z, *.bak, a.out, core\fR, etc"
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.FL "\-m" "If device full, prompt for new diskette"
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.FL "\-n" "Do not backup top-level directories"
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.FL "\-o" "Do not copy \fI*.o\fR files"
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.FL "\-r" "Restore files"
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.FL "\-s" "Do not copy \fI*.s\fR files"
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.FL "\-t" "Preserve creation times"
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.FL "\-v" "Verbose; list files being backed up"
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.FL "\-z" "Compress the files on the backup medium"
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.SH EXAMPLES
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.EX "backup \-mz . /f0" "Backup current directory compressed"
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.EX "backup /bin /usr/bin" "Backup bin from RAM disk to hard disk"
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.SH DESCRIPTION
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.PP
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\fIBackup\fR (recursively) backs up the contents of a given directory and its
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subdirectories to another part of the file system.
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It has two typical uses.
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First, some portion of the file system can be backed up onto 1 or more
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diskettes.
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When a diskette fills up, the user is prompted for a new one.
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The backups are in the form of mountable file systems.
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Second, a directory on RAM disk can be backed up onto hard disk.
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If the target directory is empty, the entire source directory is copied
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there, optionally compressed to save space.
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If the target directory is an old backup, only those files in the target
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directory that are older than similar names in the source directory are
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replaced.
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\fIBackup\fR uses times for this purpose, like \fImake\fR.
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Calling \fIBackup\fR as \fIRestore\fR is equivalent to using the -r option;
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this replaces newer files in the target directory with older files from the
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source directory, uncompressing them if necessary. The target directory
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contents are thus returned to some previous state.
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.SH "SEE ALSO"
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.BR tar (1).
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