As a reminder, this Litigation Hold preservation obligation supersedes any existing statutory or regulatory document retention period or destructive schedule. The determination of what information may be potentially relevant is based upon content and substance and generally does not depend on the type of medium on which the information exists. The information requested may exist in various forms, including paper records, hand-written notes, telephone log entries, email, and other electronic communication (including voicemail), word processing documents (including drafts, spreadsheets, databases, and calendars), telephone logs, electronic address books, PDAs (like Palm Pilots and Blackberries), internet usage files, systems manuals, and network access information in their original format. All ESI should be preserved in its originally-created, or “native” format, along with related metadata. Relevant backup tapes and all indexes for those tapes should also be preserved. Further, information that is reasonably accessible must nonetheless be preserved, because such sources will, at the very least, need to be identified and, under compelling circumstances, may need to be produced.