How do I know if my apps will work under Yosemite?

Hey guys, I'm running Yosemite right now on a mid-2011 Mac Mini that was originally running Lion. I then installed Mavericks on top of Lion(I didn't try Mountain Lion) and then I installed Yosemite on top of Mavericks. I'm planning on erasing the 500GB HDD and installing a fresh copy of Yosemite and then restore my apps and system preferences via an external Time Machine USB HDD I've been using for 2 years. 
  I'm having a spinning beachball issue that renders my Mac Mini unusable for a few minutes at a time and this is why I want to do a clean install of OSX.
So far my apps have been running great under Yosemite, BUT I'm worried that my apps are running great ONLY because I was running Lion and Mavericks before so the apps I'm running now are only working because the apps were installed onto the Lion and Mavericks 'layers'??? I haven't needed to re-install any apps since installing Yosemite.
  How can I check that my apps will run under Yosemite? 
  Please help!

NewbMacUser wrote:
From what he said here: "Because, after you run the Upgrade, it is running Yosemite and not Lion or Mavericks."
How does that translate into this
So whatever apps I'm running at the moment on Yosemite will definitely work when I wipe the Mac's HDD?
You need to slow down and read what is being written

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