Nothing we haven't done many times before.
And it was about time regardless.
My OS drive was so inflated I had barely a few gigs left.
And I move all library folders off to a storage drive.
As for backups, can't do anything loosing anything at all.
Seems I have forgotten to backup my voice attack, and I'm starting to suspect my voiceattack license was bought with an email account on a domain I have now let lapse and no longer exist...
Gave a quick test in elite, just undocking from a station, and I'm not seeing that huge a difference, although I am running some rather cranked settings.
HMD-q 1.5, SMAA, and Ambient occlusion to medium or something.
You have to compare like for like, what were your settings before?