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One of the hard requirements of WordPress theme is presence of style.css file with a header. It doesn't go beyond file being present or even used at all, it can be otherwise empty. The CSS itself has no requirements on WP side and falls under generic web development.
There are several options, you might want to combine them in some way. The list is in an increasing order of complexity and time that you will need to spend to implement it. Backup plugins. They usually do a full backup of the site and let you restore it into different domain. You can automate task like use registration and post deletion by writting ...
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