A sample document preservation letter (also known as a preservation demand or preservation notice) asking a nonparty to preserve relevant hard copy documents and electronically stored information (ESI). This Standard Document has integrated notes with important explanations and drafting tips addressing what an organization or its counsel should consider before sending a document preservation letter to a nonparty, when to send the letter, to whom the letter should be addressed, the effect of the letter, and what information the letter should contain.