Dropbox
Backing up and/or syncing your files across multiple computers may not seem like one of the sexiest things to do but I'm here to tell you that it can be, if you use a service like Dropbox. I get it, when you are knee-deep in that report, the last thing you’re thinking about is “Where can I store this document safely in the cloud?” Fortunately, there’s a service called Dropbox that does all that thinking — and the heavily lifting of actually backing up and syncing your data — for you.
It’s pretty simple. All you have to do is download the Dropbox client to your PC or Mac or Linux desktop and set the folder you’d like Dropbox to sync with. Anything in that folder is automatically synced into your Dropbox account (which starts out at a free 2GB but has [paid] tiered upgrades) and can be accessed anywhere you have an internet connection. There are also mobile apps (iOS, Android, Kindle Fire) for Dropbox that let you peruse your files on the go.
If you’re in need of a place to back up your files, what are you waiting for? Download Dropbox, create an account and stop worrying about backups and file syncs.