Automaticly backup image blog

Automaticly backup image blog

I have a image blog at soup.io, similar to tumblr, where I post images I find on the net for my friends. But I also would like to have a local copy of all the images on my mac to use as wallpapers etc. I would download them via hand, but it is to cumbersome as I sometimes several dozen pictures a day. Do you know any software or service, that could help me?