easiest way for backup?

Reflect (free) by Macrium

http://www.macrium.com/reflectfree.aspx

How often you wish you can easily backup your data? The program will update your backup only the changes. All you need is

1. install the program.
2. create a profile (e.g. one directory per profile).
3. run the profile.

On your next use...

4. run the profile.

One tip, though, is that I usually prefer to confirm that the profile is "keep the file if not found on source". i.e. if you accidentally delete a file you still need to keep, the backup copy will not be deleted when you perform the backup.

Of course, the backup looks just like a regular directory on another drive. You can copy it back anytime. My personal thought is that I prefer to keep those I delete because I only keep current files on my present drive. My backup is like an archive.