There are lots of ways of accessing your files remotely, the easiest of which in my opinion would be to use Dropbox. But if you need more storage, or are just too stubborn to learn how to set-up your own Dropbox account, then you might want to check out iTwin.
As you can see in the picture, iTwin consists of a pair of USB devices with a special connector. In order to use iTwin, first connect one of the USB ends to your PC’s USB port with the two halves connected to each other. This generates a private security key that the two halves will share.
From there it’s as simple as using Dropbox. Just drag files, folders and even entire drives if you want into the iTwin window to indicate which ones you’d like to access remotely. When you take the other half and plug it in to any other PC, you’ll be able to access and edit the files you specified, as long as both PCs are powered on and are connected to the Internet. Think of the iTwin like the two ends of a giant, limitless USB cable, and it makes way more sense.
I’m fine with the space that my Dropbox provides, since I only use it to store select documents and images anyway. But I know a few people who would find the iTwin very helpful – especially because of the unique device-to-device security feature. You can order it now at Amazon for $100 (USD); a grey version is also available. Check out iTwin’s website for more info.