Ask How can I create backup for my membership site?

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I have a membership site and I'm worried about losing all my data. I've heard that backups are important. But I don't know where to start. Should I use a plugin, or is there a manual way to do it? I also don't know how often I should back up my site. I want to make sure my members don't lose access if something goes wrong.

What's the best way to create a backup for my membership site?