Noob questions about previous versions VSS volume shadow copy in windows 10

I'm noticing that on all the machines I am looking at - about 5 of them, windows 10 pro...

when I right click on the c drive, choose properties, click on previous versions tab, they all say 'no previous versions is available'.

Am I doing something wrong?  they've been running for months or more, so there should be some?

I right click on computer, choose properties, click on system protection, on a couple, prrotection settings for the C drive says off.  

Is that the default?  I click configure. do I want to turn on system protection? Or just give it disk space? or both?  I don't necessarily want restore points... just the ability to get an older version of a file I might have edited too much?

Or restore points and previous versions go hand in hand?

So I turn on system protection. What;s the 'right' amount of hard drive space to give it?

but wait, I see other people saying previous versions tab doesn't actually work in win 10? you need shadow copy view?

But even that says that previous versions will show some, maybe not all previous versions?

How do you control how often previous versions snapshots are taken? is it for the whole drive or each time you edit a file, a previous vrsion of that file is taken? so 1 file might have 10 previous verisons in 1 day, and others have none if they weren't changed?
BeGentleWithMe-INeedHelpAsked:
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McKnifeCommented:
What you are looking for is called "file history".
https://www.groovypost.com/howto/configure-windows-10-file-history/ is an introduction.
I heard that Microsoft would want to retire that feature in windows 10 1709 and merge it into other backup features, so you will need to check if that link still applies.
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JohnBusiness Consultant (Owner)Commented:
Set Restore Points here.

Windows-10-Restore-Points
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BeGentleWithMe-INeedHelpAuthor Commented:
Thanks!
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JohnBusiness Consultant (Owner)Commented:
You are very welcome and I was happy to help.
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