2GB worth of online backup space for FREE!

Dropbox is a relatively new application that you can get from https://www.getdropbox.com/. It is free to download and use for Windows, Mac, and Linux, but you may want to make sure your flavor of Linux is supported before assuming it is. The software itself provides automatic synchronization of a folder on your computer with the online server. You can install Dropbox on multiple computers, which then allows you to share those files between the machines and also maintain multiple backup sources for those files.

Some of the key features of Dropbox are:

You can also manage your files online through Dropbox's web interface

Photo galleries are created automatically, and can be shared with a simple URL string

Synchronization is automatic and fairly quick from my experiences

Easy to install and use

You get 2GB of storage free, and then have the option to pay for more if you'd like or try to refer friends for additional space (250MB per referral, to a maximum of 3GB for free). The cost is relatively inexpensive though, with 50GB of space costing $10/month.

My cousin had been using Dropbox on a Mac to transfer files back and forth to a Windows machine, and suggested the program to me because he really likes it. After looking into it and using it for a while, it's definitely a nice tool, and for most people the 2GB limit will probably be more than enough for your important files. Feel free to give it a try and let me know how it goes!

If you're just looking to send someone files that are too big to email, check out my other post about a free service called Sendspace.