How to sync my external hdd with my hdd?

I back up my files with my external harddrive. I'm using SyncToy to sync my external hdd with my, but it sucks. I'm looking for a program which can automatically update/edit/copy/delete/move files on my external hdd and make changes whenever there is changes in my PC hdd.

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Re: sync
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(NT) Try Easeus Todo Backup Free. It works for me.
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There's a problem in that idea.

Let's say this is your backup copy. Let's say you accidentally delete your stuff.

If this is automatic, won't you lose your external copy too?

Why not run the sync when you know it's time to do that?

I found another Sync I like at

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