California Code, Code of Civil Procedure - CCP § 2025.550

(a) The certified transcript of a deposition shall not be filed with the court. Instead, the deposition officer shall securely seal that transcript in an envelope or package endorsed with the title of the action and marked: “Deposition of (here insert name of deponent),” and shall promptly transmit it to the attorney for the party who noticed the deposition. This attorney shall store it under conditions that will protect it against loss, destruction, or tampering.

(b) The attorney to whom the transcript of a deposition is transmitted shall retain custody of it until six months after final disposition of the action. At that time, the transcript may be destroyed, unless the court, on motion of any party and for good cause shown, orders that the transcript be preserved for a longer period.