I installed WinServer 2012 essentials on my EX490. By the way that VGA Gen 4 damn what i great tool. Talk about saving time.

I did Storage Spaces with Two-Way mirror instead of RAID-5. My questions are the following

1) Is the Two-Way mirror considered to be the same as RAID-5?
2) If the OS Drive drives and I replace the HDD will I be able to gain access to my current Storage Pool?

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EX490
CPU E6550
8TB HDD's
2GB RAM

I think you would be better served with stabilbit than storage spaces.
storage spaces was supposed to be the next improved disk migrator to whsv1.
But my 2 cents they stripped out the most important features, and it will crash just like raid when you exceed the space allotted and/or a drive fails.
Also storage spaces is not readable standalone.

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VGA/PS2 Keyboard/PS2 Mouse/Serial debug board
Popcorn C-200
Popcorn A-200
Dune HD Connect
Rasberry PI OSMC(KODI)
ReadyNAS RN316
Amazon FireStick
Amazon ECHO
AnyDvD
MyMovies