I can't login to admin after backup due to Cloudflare

Cloudflare isn’t broken, your implementation was.

Let’s Encrypt won’t enroll a certificate while CloudFlare is proxying. It prevents the verification from going through.

You can’t use any of their ‘performance’ features with Discourse as it alters the already-minified code.

All CloudFlare can do for you is hide your IP and act as a CDN for your uploads. The benefits are minimal.

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