Well, I was Windows 7 back in the day, bypassed Windows 8 and went straight to Windows 10. Mind you, that took over 48 hours to upgrade! I thought it was stuck and it was just as well I had a hissy fit, stomped out, but forgot to unplug the laptop. Came back 2 days later and it was just finishing! It worked just fine for a few years until the laptop died, so I went out and bought a new laptop, obviously more powerful than my very old one, but Windows 10 on it? Just fine.
So, if I was going to do it again, just my personal opinion, I would go Windows 10 ready loaded on a new, up to date machine.
But as you're not intending to upgrade, just keep your data backed up as you suggest. But ready yourself for what could be inevitable :wink: