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Man Pages


Manual Reference Pages  -  PDUMPFS (8)

NAME

pdumpfs - A daily backup system similar to Plan9’s dumpfs

CONTENTS

Synopsis
Description
Example
Limitation
Tips
Author
See Also

SYNOPSIS

pdumpfs src-dir dest-dir [dest-basename]

DESCRIPTION

pdumpfs is a simple daily backup system written in Ruby( ruby(1)), which is similar to Plan9’s dumpfs that preserves every daily snapshot.

Back up your home directory with pdumpfs, and you can retrieve any past day’s snapshot of any file.

pdumpfs constructs each day’s snapshot in the directory named YYYY/MM/DD under the destination directory. All source files are copied to the snapshot directory for the first time, and on and after the second time, pdumpfs copies only updated or newly created files and stores unchanged files as hard links to the files of the previous day’s snapshot to save disk space.

The latest version of pdumpfs is always available at http://namazu.org/~satoru/pdumpfs/.

EXAMPLE

To backup your home directory /home/yourname to /backup, run the following command.

    pdumpfs /home/yourname /backup >/backup/log 2>/backup/error-log

On and after the second day, it is a good idea to invoke the backup command with cron(8) daemon. Adding the following line to your crontab file allows you to back up your home directory at 5 a.m. everyday.

    00 05 * * * pdumpfs /home/yourname /backup >/backup/log 2>/backup/error-log

If the backup system works well, you can retrieve any given day’s file with a file name like /backup/2001/02/19/yourname/...

LIMITATION

pdumpfs can only handle normal files, directories, and symbolic links.

pdumpfs may not work on systems other than Unix because pdumpfs utilizes hard links.

pdumpfs is not suited for a directory containing large files which are updated frequently.

If more than 31 day absence occurs, incremental backup would not be performed. So, back up your files on a daily basis.

With pdumpfs, you can safely remove unnecessary files because the past files can be retrieved at any time. However, you must not rely too much on pdumpfs. It may have serious bugs.

TIPS

If the total disk usage increases by 10 MB everyday, about 4 GB disk space will be consumed every year. It would not matter so much considering the recent evolution of computer resources.

Back up your files to a physically separated device.

On some systems, files can be made immutable.

To make all files in /backup immutable on Linux, run the following command as root:

    chattr -R +i /backup

On BSD 4.4 derived systems, run the following command as root:

    chflags -R schg /backup

These commands will keep you from accidentally removing your backup files with rm -rf.

AUTHOR

pdumpfs and the HTML document were written by
.An Satoru Takabayashi Aq satoru@namazu.org .

This manual page was translated from the HTML document by
.An Hiroyuki Shimada Aq shimaden@din.or.jp , and reformatted by
.An Akinori MUSHA Aq knu@iDaemons.org .

SEE ALSO

chattr(1), chflags(1), crontab(5), cron(8)
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