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B'midbar
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Way I see it, best method for testing the preview is:
1. Create recovery USB on 8.1
2. Use File History to create a full system image
3. Upgrade to Win 10
Then when you have issues, rollback to 8.1, then use advanced boot to restore your full image of your 8.1 build - getting rid of broken apps, settings, e.t.c. and everything will be just as you left it.
Exactly what I did, because Win 10 just isn't ready for me yet.
I use Macrium Reflect and a WinPE boot USB. Had a full 8.1 .rimg walking into 10 TP and used that to restore to where I was in about an hour. Re-flashing's no big deal, but I really hate the hours it takes me to re-install and configure all my apps. The preceding coupled with all my data being on the microSDHC (excluding VMs) and I'm back on 8.1 in an hour's time with my apps and data right where I left off.
My interest was the scaling on multiple monitors and 9926 nor any previous build has addressed that yet. That, coupled with the bluetooth issues was enough to wave me off. Will put TP back into a VM and ride it out from there.