Most of the time, taking metadata back up of your org involves lots of manual effort or usage of some third-party tools. So I would like to share a comparatively simple approach that involves less manual effort.

This is using the power of sfdx metadata api commands along with PowerShell script.

Another advantage of this approach is that you can schedule future downloads. We were forced to come up with an approach like this for one of our client org - Since the org has a large component count which is developed through 15 years and most of the existing tools are not able to support a complete backup of this org.