How do I know it's backing up my data?

I'm running 8.1
I have an "E" drive that is supposed to provide a place to back-up data. How do I know it's actually working? The file data date is 8/15/18, which is the date I told it to set up the regular windows back up. The disk is about 1/3 full, which doesn't really tell me anything. I've tried to open the files to see if there are any later dates or to see if there is any data, but can't find any data I recognize or any later dates.

Is this really backing up my data?

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Reply to: How do I know it's backing up my data?
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Clarification Request
Is it "Windows Backup"?

If so I will write I don't count on Windows Backup for backup or restore. It's been too unreliable. What works for me is a clone of the OS drive and for data any "SYNC" app like Roadkil's Unstoppable Copier.

After so many Windows Backup failures, my answer is it doesn't work.

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Re: backing up

Even if it's backing up all your data, it's totally worthless if you don't know how to restore a specified file, say that very important file that you accidentally deleted.
Since it seems that at the moment you are unable to do that, my advice is to find another backup method.

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