I don't believe there is a command to export a database (I haven't come across one in all my years of using database, but I've never looked either).

I believe you would have to execute a script using cron jobs that would select the contents of the database, export in the format you want, and either store the backup however you wanted it stored.

Again I could be wrong, but I have never heard of a simple command to do all of this.

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