Backing up files with rsync27. Jun '10

I wanted to keep a backup of my NAS contents. It's a router running DD-WRT with USB harddisk attached to it, serving files via SAMBA. After digging around on the internet, I figured out that I should use rsync to do the job. It provides way to transfer differential data so I don't need to wait for 50 gigabytes of photos to get copied during every backup session. By default it uses SSH to transfer data, but it also has it's own rsync:// protocol which isn't encrypting the data. Since router isn't very powerful, it makes sense to disable encryption and compression.

Source machine

On the DD-WRT box I already had set up optware , so only thing I had to do was:

ipkg-opt install rsync

And to create configuration file for rsync in /opt/etc/rsyncd.conf:

uid = nobody
gid = nobody
use chroot = yes
max connections = 5
syslog facility = local3
pid file = /var/run/
secrets file = /opt/etc/rsyncd.secrets
socket options = SO_SNDBUF=65536,SO_RCVBUF=65536

path = /mnt/Photos
comment = Photos
read only = yes
hosts allow =

This configuration serves files from /mnt/Photos under share name "photos", allows only connections from IP that's my desktop. For improved security the process switches to user and group "nobody" and chroots into the target folder. To start the daemon I just issued:

rsync --daemon

Target machine

On the Ubuntu desktop machine I just downloaded rsync via APT:

sudo apt-get install rsync

Finally I ran following command to download changes from the router and keep /mnt/backup/Photos synchronized with the contents on the router:

rsync --verbose  --progress --stats \
    --size-only --times --recursive --perms \
    --links --delete --exclude "*~" \ mnt/backup/Photos

Alternatively you can use gtkrsync or grsync to do the same job with GUI application

DD-WRT backup rsync