Synctoy - Free Backup Software For Windows

Synctoy is free backup software for windows.

You can setup folder pairs to copy the contents of on folder to another.
An example would be to setup your 'My Documents' folder, and copy it to a folder on an external drive.

Not only do I use it to copy important files to my DropBox folder, I use the windows scheduler to automatically run the software and copy all folder pairs at midnight.

Use this path as a guide to run All folder pairs in scheduler.
"C:\Documents and Settings\[WINDOWS USER]\Local Settings\Application Data\SyncToy\SyncToy.exe" -R

Download it HERE