Create A Backup Where Can Access The Files Individually?

I recently purchased a new external hard drive. It is a plug and play seagate expansion. I like how Windows Backup saves all of the files that you have modified since the last backup automatically at a certain time that you designate. However when you go into the backup file, they are all zip files and have things all split up if they are big, and I have some big files. Is there a free backup software that functions like the Windows 7 Backup program but is more like an automatic copy and paste thing, or can I get Windows Backup to function as follows. For example, I want it to automatically copy and paste the files that have changed since the last time over to the external hard drive, and I want them to remain the way they are. I don't want them in the zip files, I want to be able to access a single file the same way I normally would. I don't want to have to remember all the files I've changed throughout the day and copy them over myself. So it's basically an exact copy of my Library that updates automatically when I plug the hard drive in or at a scheduled time.