The Big Duck

I have a TruNAS Mini XL+ running TruNAS 13.0 Stable. I would like to switch to a more user friendly experience. Previously, I had Synology but the hardware would usually fail just about 1yr after the warranty expired. 1) DO I need to fully back up my TruNAS data and then install HexOS? 2) How much does HexOS cost? How do I install it?