Safe Upgrade?

I already have a Hackintosh which is pretty stable (but still has a few little 'characteristics' that I have to live with). I'd like to upgrade it to Mojave but I'm really keen to establish a 'safe' point that I can fall back to should I be unable to get Mojave working properly.

I was thinking of buying a new SSD, mirroring the existing drive and starting from there, but that's not the cheapest option. What alternatives do I have to ensure I don't lose my existing build?

submitted by /u/Beanb0y
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