I have had a habit for years when buying a new PC. The first thing that I do is create a data partition (D:) on my hard drive. I use this to store all of my files, changing the Windows "My Document, Pictures..etc". to use the new partition.
This does a few things. First, it makes it easy to restore an Operating System without worrying about my critical files. Second, it makes backups a breeze - just back up the partition, either on a file by file basis or by imaging the partition. Third, it makes it easy to install an SSD as a boot/app drive - just cone the old C:\ drive to the new drive.I am sure that readers can think of other advantages as well.