Hi
What you are doing looks like it's creating a recovery partition similar to what a factory created partition would look like.
So essentially the whole partition is what you need to remove.
You might want to make the partition larger then that before you create a new backup on it, my recovery partition is 200 Gb and allows me to have up to 3 backups of my C:\ drive on it.
What you are creating if I understand it correctly would replace you Windows install but nothing else on your C:\ drive and since it could possibly overwrite the whole drive may cause you to lose all of the other data on the drive.
You might want to consider creating a system image using software like EaseUS Todo backup and recovery free version.
It will backup the entire C:\ drive and let you get all of your data back if you have to use it to recover your computer from a crash or virus situation.
It will make a DVD or USB drive that will boot you computer and restore the C:\ drive back to just the way it was when you backed it up.
Best free backup software for Windows 10, Windows 8.1, Windows 8, Windows 7, etc - EaseUS Todo Backup Free The size of the backup file is dependent on the size of the C:\ drive, so I don't install any of my software or save my data on my C:\ drive.
My Windows install on the C:\ drive is on a SSD all by itself.
My backups are on another hard drive but could be on an additional partition on the same drive.
The fact that the data and software are on other drives, lets me backup or restore my computer in about 20 minutes.
Mike