Hey all,
I’ll pass this along to the content team to make a thorough guide 
For now, if you’re not on Flywheel then I recommend using a product such as Duplicator or BackupBuddy to create a backup of your site that you can import into Local.
After downloading the full backup, drag and drop it onto either Local’s Dock icon or window and it’ll start the import. Please note, you need Local 1.4.1 or newer.