I haven't tried or used this, but you could try implementing your own version of sparkleshare: http://sparkleshare.org/ http://sparkleshare.org/ It's open sour

I haven't tried or used this, but you could try implementing your own version of sparkleshare: http://sparkleshare.org/ http://sparkleshare.org/ It's open source, and uses git to backup files. Not sure how close to your needs it is, but I'm sure there's other stuff a google search away.