Best way to clone/backup my site?

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Hi, I’m new to WordPress.

I have created a website, and it is done, but I want to improve the SEO, page loading speed, etc and before doing anything I want to backup the entire site before I fuck it up.

What’s the best way to backup my site? There is any free plugin to do it? Should I download somehow the entire site?

What’s the best way for this situation?

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