I know this has been around for a couple of years but it hasn't been posted since it has grown from 5GB to 25GB.
You can use Microsoft skydrive as a space to copy all your data to and either keep it private for back up purposes or share folders with other users like photographs.
You can either use the web interface or use third party applications to map a drive to your computer, allowing you to drag and drop using the native windows interface.
Google offer a similar service but it is capped at 1GB. You can get a 20GB service from them at $5/year. However as Microsoft offer 25GB for free, I have advertised them.
I can not stress the importance of backing up data. We all know someone who has lost documents or photos to a dead hard disk, this service offers free protection against such an incident.
Hope it helps.