As you own the originals you are allowed backups for your own use.
Is your vinyl so rare that you couldn´t find a decent quality download of it online?
Well, I have vinyl that I’m pretty damned sure I could never find in digital form. Mostly singles, but I have albums that are thirty+ years old that are unlikely to be considered important enough to digitise.
Although, you never know; I have an album by a North-country band called Beckett, who had a member who rejoiced in the name of Kenny Mountain, which I used to rather enjoy. Just recently I found a digital copy online, which I was able to download free. Not perfect, it’s just a straight vinyl copy, with pops and clicks, but perfectly listenable. It’s highly unlikely that any official digital release would happen for such an obscure album.
Fortunately, most, if not all, of the singles are on high quality cassettes, chrome and metal recorded on my old Aiwa F770 deck from my Logic/Zeta/AudioTechnica turntable, when it worked! So I’m going to get one of those £30 tape players that convert to MP3 and plug it into my Mac and get those legacy tracks into iTunes.