Auto Transfer Data from 1 Mac to another?

rsync? Sync Folders?

 

I find that the Google drive desktop client is the best solution for this. It starts you off with 15Gb of free space and if you need it you can buy 100Gb for $1.99 a month or 1Tb for $9.99 a month. After the setup it essentially creates a folder that syncs across multiple devices provided you have it installed on those devices. It's also accessible over the internet if you're on a computer that isn't yours for example. There's more details about it here. https://www.google.com/intl/en/drive/#start
One feature that I use a lot is the sharing function. You can let other people see specific files or folders in the drive if you want or keep it completely private. This is great if you're collaborating with other students on a group project, It also remembers revision history.

A couple of photos to illustrate how it works

 

Synk Pro should be able to do this. Check it out at https://decimus.net

 

I use this for DropBox like functionality without storing anything in the cloud.
http://www.bittorrent.com/sync