I have a home-baked system like this, mostly just files in folders and in some cases HTML-based indexes. It's not perfect and nowhere near as usable as Recall looks, but it works for me nonetheless.

I won't use Recall. It's just another Web app, and thus subject to the whims of the owners (selling my data, injecting ads when other sources of income fail, etc). I would be much more amenable to a desktop app I have absolute control over. They keep my data (assuming I were to use Recall) on their servers - but no comments I found talk about data protection or what happens to my online data if they fail, sell or merge with another company.

These days if I don't get absolute control of my data it's just not going to happen.

A model I would be happy with is a desktop app that syncs with a mobile app, encrypts everything, and is purchasable with a one-time payment.

I'm tired of Internet-everything. It always ends in disappointment for me.