Backup to external drive

So time for another question from me.
I want to set up my computer so that when i plug in my external harddrive, it will compare certain folders to ones that exist on my pc, and then copy any new files and stuff, from that folder, to the drive.

Once again I'm a noob and need some help from the smart people here

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not sure if this is what you are looking for, but I think this might solve your issue


The guy uses official (but includes crappy adware)
google drive link (download with caution)

Running Windows 10? File History should do what you want.
(Settings/Update & History/Backup)