Ivor O’Connor

July 25, 2009

Automatic Backup With Rsync And Cron On Ubuntu

Filed under: BACKUP, CRON, mint 14 xfce, rsync, SSH, ubuntu — Tags: , , , , — ioconnor @ 6:28 pm

Keeping a directory automatically backed up somewhere is always useful. Every few months this is needed on one machine or another. Here are the steps:

  1. First set up ssh keys so passwords are no longer needed.
    1. Test things by verifying a ‘ssh user@yourserver.com’ does require a password.
    2. Make some ssh keys on your client and then move the public key to the server
      1. cd ~/.ssh
      2. ls
      3. ssh-keygen -t dsa (Keep the defaults by just pressing enter a few times.)
      4. ssh-copy-id -i ~/.ssh/id_dsa.pub user@yourserver.com
    3. Test things by verifying a ‘ssh user@yourserver.com’ no longer requires a password.
  2. Determine the directory to be backed up and where it will be backed up and test the command to be used.
    1. time rsync -atvz ~/local-directory-of-your-choosing/ user@youserver.com:remote-directory-of-your-choosing/
    2. log in the server and verify the files are there…
  3. Put the command in cron. Because cron is broken in ubuntu you can’t simply do “crontab -e” anylonger. (How can something so basic be broken?!) Instead follow these instructions:
    1. vi ~/some_file and put in the cron commands
    2. @hourly rsync -atvz ~/local-directory-of-your-choosing/ user@youserver.com:remote-directory-of-your-choosing/
    3. crontab ~/some_file
    4. crontab -l

Now simply test it out…

UPDATED ON 2013-02-02: Used “ssh-copy-id -i ~/.ssh/id_dsa.pub user@yourserver.com” to reduce 10 or so steps and make things vastly simpler.
UPDATED ON 2013-02-05: I came across this article today and realized I should probably update this to use the “–delete” and “-e ssh” commands. I am already a big user of the delete command but I don’t often use ssh because my backups are local for the most part.

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