Before flagging as duplicate please note that other similar posts 
do not have the same criteria below. Thanks

Im looking for an app that will let me automatically sync a usb drive with a folder on my home system over the internet. I would like to roam from computer to computer and run this syncing app from the usb drive. Im looking for the same functionally as DropBox but without the 2gb restriction and without the need to fully install.

• Two Way sync between a usb drive and pc over the net
• Utilizes the full size of the usb drive not limited by an online storage size. (I dont need online backup or versioning)
• Allows the removal of the usb drive, Plugging it in to another computer will resume its sync.
• While the drive is connected the app should run silently keeping changed files in sync. (I dont want to run a manual process other than simply starting the app)
• Must be able to run as a portable app from the usb drive but can fully install on home pc.
• Window 7 Support is preferable.

Please let me know if such and awesome app exists. TIA!