Deploy to Local Directory
The Local Directory method saves your static site to a folder on the same server where WordPress runs. It's a good choice when you want to serve the static files straight from that server, for example by pointing a domain or virtual host at the folder, or when you simply want the files in a known location so you can move or sync them yourself.
Choose the Local Directory method
Open Simply Static > Deploy. Under Deployment Settings, set the Deployment Method dropdown to Local Directory, then click Save Settings.

Set the path
In the Path field, enter the absolute path to the folder where your static files should be saved, for example /Users/patrickposner/Local Sites/simply-static-dev/app/public/static/ . Simply Static creates this folder automatically on the first push if it doesn't already exist.
If you're not sure of the path, click Copy home path to grab the absolute path to your WordPress installation as a starting point, then adjust it to point at the folder you want.
Clear Local Directory
When the Clear Local Directory toggle is on, Simply Static empties the target folder before each push, so you always end up with a clean copy and no leftover files from previous runs.
It's worth pointing this to a dedicated output folder. Since the option clears everything in the path you set, make sure that path doesn't also contain other files you want to keep.
Push your site
With everything set, click Push from the panel on the left. Once it finishes, your static files will be available in the folder you specified. You can follow the progress at any time under Simply Static > Activity Log.
If you plan to serve the files from a domain, it's worth confirming your link settings under Simply Static > General first. See How to replace URLs for guidance on choosing the right option.