Blue Iris

My V4.8.6.3 system was working fine with 12 cameras. I exported my settings thinking I could try a schedule change and if it didn't work, I could roll back by importing the saved settings back again.
I imported my settings that I had saved 10 minutes prior and I lost half my cameras. I rebooted and imported again from the same .reg file and now I only have one camera.
I've tried the import several times and each time I get a different result. 2 cameras, 4 cameras, back to 1 camera.
How do I get back to where I was an hour ago when everything was working?

Update: I kept reimporting over and over. Each time I got different results; 1 camera, 6 cameras, 2 cameras.
I started deleting all the cameras prior to the import, but that didn't help.
Finally after about 10 tried, I got all my cameras to show up.
I have no idea why as I didn't do anything differently.

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Until I read your answer, I didn't even realize that you could export individual cameras. Thank you for that tip, I will start doing that too.