Making Backups with rsync


Making Backups with rsync

The rsync utility is a fancy way to synchronize files and directories, either locally or across a network. We like to use it to make backups so we don't have to worry when we mess something up. Yes, we could use cp or something equally boring, but we like the speed and flexibility of rsync. In this example, we're copying files locally, but we could as easily be making remote backups to another server somewhere else.

To Make Backups with rsync:

1.

mkdir ~/.BACKUPDIR

Create a directory to house your backups. Ideally, you'll create the directory on a different physical disk from the stuff you're backing up, but do what you can. We're creating a backup directory that's a subdirectory of the home directory, which will help protect us against self-inflicted damages but not against a disk failure. (We trust the system administrator for protecting against disk failures...er, Eric, you are up-to-date on our backups, aren't you?!)

2.

rsync -v -a /home/jdoe/data ~/ .BACKUPDIR

Specify the rsync command, the v (for verbose) and a (for archive) options, and the source and destination directories (Code Listing 17.8).

Code Listing 17.8. The rsync utility is a handy tool for making backups. Note that it takes much less time for all updates after the first one.

[jdoe@frazz bin]$ rsync -v -a  /home/jdoe/data ~/.BACKUPDIR building file list ... done data/ data/#*scratch*# data/#all.programs# data/#local.programs.txt# data/*scratch* data/1 data/2 data/Mail/ data/News/ data/Project/ data/Project/keep data/Project/keeper.jpg data/Project/kept data/Project/kidder.txt data/Project/kiddo data/Project/kidnews data/Project/kidneypie data/Project/kids data/Project/kidupdate data/address.book data/address.book~ data/all.programs data/b data/backup-files/ data/backup-files/.Xauthority data/backup-files/.bash_history data/backup-files/.bash_logout data/backup-files/.bash_profile data/backup-files/.bashrc data/backup-files/.mailcap data/backup-files/.screenrc data/backup-files/.ssh/  ... wrote 24841142 bytes  read 14708 bytes  741965.67 bytes/sec total size is 24779055  speedup is 1.00 [jdoe@frazz bin]$ [jdoe@frazz jdoe]$ rsync -v -a  /home/jdoe/data ~/.BACKUPDIR building file list ... done data/newer.programs.txt wrote 30149 bytes  read 36 bytes  20123.33 bytes/sec total size is 24765461  speedup is 820.46 [jdoe@frazz jdoe]$ 

Wait while it does the initial backup (showing you each file as it gets copied). The first backup takes awhile but no longer than using cp would.

Tips

  • If rsync isn't available on your system, revisit Chapter 14 to learn how to install it.

  • When you subsequently run rsync, you'll discover that it's far faster because it copies only the files that have changed. Handy, huh?

  • You can gain benefits from rsync if you start making backups across a network. For example, you can synchronize your Web server content with your friend's content located on a different server. Check the rsync man page (man rsync) for the specifics.





Unix(c) Visual Quickstart Guide
UNIX, Third Edition
ISBN: 0321442458
EAN: 2147483647
Year: 2006
Pages: 251

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