Cal. Civ. Proc. Code § 2019.040

(a) When any method of discovery permits the production, inspection, copying, testing, or sampling of documents or tangible things, that method shall also permit the production, inspection, copying, testing, or sampling of electronically stored information.

(b) All procedures available under this title to compel, prevent, or limit the production, inspection, copying, testing, or sampling of documents or tangible things shall be available to compel, prevent, or limit the production, inspection, copying, testing, or sampling of electronically stored information.