Free Backup/Synch/Storage

Cloud comes to rescue!  Upload/Download any files/folders with just a drag&drop in some sites! It is 100% Free!

Windows Live SkyDrive : http://skydrive.live.com/
Windows
Windows Live SkyDrive gives you 25 GB of free online storage. SkyDrive makes it easy to access your documents, photos, and videos anywhere—and share them. The only limit: You must keep to no more than 50MB per file.

CloudDrive  http://www.driveoncloud.com/
Windows
You get 5GB of free online storage with Adobe Acrobat Online Storage Service. Uploading and downloading from such a service isn't always easy though, especially if you want to grab a whole folder of data. CloudDrive, a free client for Adobe Acrobat Online Storage Service, lets you do exactly that via drag and drop. 

Dropbox  http://www.dropbox.com/
Windows | Mac | Linux | Web | Mobile
Our Editors' Choice for cloud-based automatic file sync, Dropbox is the epitome of a set-it-up and let-it-go service. Install it on any desktop or laptop computer and all the files in your Dropbox folder appear on all systems (or on a friend's if you share a folder). It's free for up to 2GB of data synched, and that's data you can access on your iPhone or via the Web, too.