Backing up before 10 upgrade

Right now I'm running 7 Pro 64Bit w/SP1.
My OS is on a 750GB SATA HDD.

I've never done this before & there are points the 10 upgrade may do to my machine that I don't personally like, so I would like to know how to go about making a full system backup.

What would be the simplest, but most complete way of doing this?
1. Should I use Microsoft's own Backup program or should I download some other (free) program?
2. I also have a 500GB SATA HDD, can I use this as my backup destination?

Is the 500GB drive a second drive installed in your computer - if so, that makes a great place to use for an automated backup routine. Regardless, as long as it's not the same hard drive as your Windows system is on, I would back everything up to the 500GB drive - meaning backup your personal files that you have created (not the operating system files).

I just copy everything from "My Documents" which includes all the subfolders (pictures, music, documents, etc.). You may also want to save your e-mails and internet favorites. I use the windows file explorer to copy the files from one destination to the other. No backup program used for this one time backup/copy process.

One thing I do that is not standard is that I create a subfolder under "My Documents" called "Outlook" and then I have my Outlook e-mail program use that folder to store my e-mails rather than the standard location, then when I need to backup everything I don't forget to save the e-mail files (which on a standard windows/outlook install are a little hard to find).

The OP is talking about backing up files before the upgrade to Win10, so he wants to back up personal files. At least that's how I read the question.
In this case (Win7 to Win 10 upgrade, a complete image won't help (as OP would then be restoring everything back to Win7 if the image was restored). After the upgrade, making a system image is a good idea.

Thanks for the help both of you.

1. I'll take a look at the Macrium Reflect Free Edition, I've read other's recommending this program as well.

2. What I mean by a Full System Backup is backing up the OS & every program installed (as well as my personal tweaks). I do have all my personal documents, videos, pictures & other files on a flash drive & external USB drive already, so that is not a problem. I want to make sure I can go back to 7 if I have a problem w/10.

I can delete everything that is currently on the internal 500GB SATA HDD, so that is not a problem either.
Below is a pic of my Computer's Disk Management, hope this helps.

Thank you for the help. I'll update this once I use the program, hope it all goes well.