I did scan of the faq and ended up up on the docs and searched for export. I was pleasantly impressed with the entry which showed an export option along with text and videos showing how to do this.
For me, I probably won't be spending 300 on this when I can wiki or wordpress for free... but if I was not so jaded about saas and cloud, I would be persuaded to check out your thing if you had on the front page like "export, backup" and bonus if it was 'import/export markdown or similar files'
I'd feel less worried about vendor lockin, holding data hostage, what happens when you go bankrupt, etc
the heading fonts on your privacy page are a little wonky in my browser (firefox) - being that you are uk and sharing data with EU and outside the EU - I'd only save info if it was encrypted.. not sure if that is a thing, if so I would make 'privacy built in' a big thing on the front page.
my cents in trying to help, I'm sure 98% of those who may use your service are not as sensitive to the same things I am - so this is not a critique saying it's bad, just offering some random thoughts as I took a look.