Remote snapshot backups with rsync and Samba

[Pete Holsberg]

 From Hackzine.com:

http://www.hackszine.com/blog/archive/2007/10/remote_snapshot_backups_with_r.html


    Remote snapshot backups with rsync and Samba

Thanassis Tsiodras writes:

    What would you do if you had to automatically backup a remote Linux
    box (e.g. your web server), and all you had locally was Windows
    machines? How about this:

       1. automatically expanding local storage space
       2. transmissions of differences only
       3. automatic scheduling
       4. local storage of differences only
       5. secure and compressed transfer of remote data and
       6. instant filesystem navigation inside daily snapshot images

    I covered all these requirements using open source tools, and I now
    locally backup our 3GB remote server in less than 2min!

We've all used Samba and rsync before, but Thanassis has really put all 
the pieces together into a complete backup system that's superior to a 
lot of commercial products I've seen.

The really impressive bit is how he's easily doing snapshot images using 
filesystem hardlinks. You can save several days worth of snapshots at 
very little cost because additional space is only taken up by files that 
have changed. Using hardlinks, identical files from different snapshots 
all point to the same inode.

    ||

    root# mount /dev/loop0 /mnt/backup
    root# cd /mnt/backup
    root# rm -rf OneBeforeLast
    root# cp -al LastBackup OneBeforeLast
    root# cd LastBackup
    root# rsync -avz --delete root at hosting.machine.in.US:/ ./

    The "cp -al" creates a zero-cost copy of the data (using hardlinks,
    the only price paid is the one of the directory entries, and
    ReiserFS is well known for its ability to store these extremely
    efficiently). Then, rsync is executed with the --delete option:
    meaning that it must remove from our local mirror all the files that
    were removed on the server - and thus creating an accurate image of
    the current state.

    *And here's the icing on the cake:* The data inside these files are
    not lost! They are still accessible from the OneBeforeLast/
    directory, since hard links (the old directory entries) are pointing
    to them!

    In plain terms, simple navigation inside OneBeforeLast can be used
    to examine the exact contents of the server as they were BEFORE the
    last mirroring.

Just imagine the data recovery headaches you could solve by adapting 
that to a cron job that shuffles a months worth of nightly backups.

Optimal remote Linux backups with rsync over Samba - Link 
<http://ttsiodras.googlepages.com/backup.html>

-- 
Pete Holsberg
Columbus, NJ

Only a mediocre person is always at his best...
-- W. Somerset Maugham

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