Once found, what do I do with NON 100% duplicate photos?

It seems to be an easy answer, delete them!

I am afraid to do that!

Perhaps deleting them isn't the answer.

We have 10's of thousands of photos on our PC's.

They have come from expended family members and our six children.

It's difficult making decision to delete them and I wanted the Forums feedback before doing it.

I assume that when I run a Scan to cull out the 100% Duplicates that it really does just that.

When I have done it, there are times it takes hours per Disk Drive.

Then I combine the results on a separate Disk Drive and repeat the process.

I however have never mentally reached the point where I confidently delete the NON 100% photos.

I'm stuck in this rut!

Is there any other strategy out there that could help me?

You can use FreeFileSync to create backups. You'll need to learn how to use it. I'd backup to an external HDD (actually two HDDs is preferable), then store that HDD in a plastic bag and in a fireproof safe rated for electronics. These safes can be had on eBay for around $35 brand new. I have three of them for all of my digital media. I do take it a step further and burn data to optical media like Blu-ray and DVD.

Also, check out these programs.

Adebis Photo Sorter - organize your photos into folders

Picasa - image viewer and organizer