What Is the Duty to Preserve?

The duty to preserve is the legal requirement to safeguard evidence that may matter to a case. It is the foundation of defensible eDiscovery. It sits in the preservation stage of the EDRM.

The preservation of evidence definition is deliberately broad. It covers any information a party knows, or should know, is relevant to a dispute. That includes electronically stored information (ESI), paper files, and the metadata behind them.

The duty does not require a party to preserve everything. It requires reasonable steps to preserve what is relevant. Courts expect diligence, not perfection.

In practice, legal data preservation means halting the routine loss of relevant material the moment a duty attaches.

When Does the Duty to Preserve Evidence Begin?

The duty begins when litigation is reasonably anticipated, not when a complaint is filed. Zubulake v. UBS Warburg established this trigger for federal courts.

Reasonable anticipation arises when a credible threat of litigation exists. Common triggers include:

• A demand letter or formal complaint.
• A letter of preservation of evidence from opposing counsel.
• A records subpoena or government inquiry.
• An event that usually leads to a lawsuit. 

A court may also issue a preservation order. This directs named parties to preserve specific categories of data.

Once the duty attaches, a party must suspend routine deletion. Auto-delete rules and recycling schedules must pause for anything relevant.

What Does Preserving Evidence Require?

Meeting the duty starts with knowing what data exists and where it lives. eDiscovery data mapping identifies the custodians, systems, and repositories that may hold relevant information.

The scope reaches everything in a party's possession, custody, or control. That drives the preservation of documents across email, chat, cloud apps, and devices.

A legal hold is the process used to meet the duty. A defensible hold does three things:

• It notifies custodians of their preservation obligations.
• It tracks acknowledgments and sends reminders.
• It documents every step for the record. 

ESI preservation also protects metadata, not just the file. Altered timestamps or stripped fields can weaken the evidence later.

The duty is ongoing. New custodians, new sources, and new facts can each widen its scope.

Why Does Preservation of Evidence Matter?

Preservation protects the complete record that litigation depends on. When relevant evidence is lost, courts hold broad authority to respond.

Under FRCP Rule 37(e), lost ESI can trigger sanctions. Careless loss draws curative measures. Loss with intent to deprive can lead to an adverse inference or dismissal.

This is also where the importance of proper documentation for court proceedings becomes clear. A documented effort is what proves the duty was met. It is the core of legal defensibility.

A weak or late hold invites a spoliation claim and complicates responses to records requests. A strong, well-documented one usually ends the argument before it starts.

Key Takeaways

• The duty to preserve is the obligation to protect relevant evidence for litigation.
• It begins when litigation is reasonably anticipated, not when it is filed.
• The scope covers all ESI and documents in a party's possession, custody, or control.
• A legal hold is the process; the duty to preserve is the underlying obligation.
• Documented preservation of evidence is the basis of legal defensibility under Rule 37(e). 

Venio Legal Hold helps teams issue holds in minutes, track custodian acknowledgments, and keep the audit-ready record that proves reasonable preservation.

Frequently Asked Questions

What is the duty to preserve evidence?

It is a party's legal obligation to protect evidence relevant to pending or reasonably anticipated litigation. It applies to ESI and paper records alike.

When does the duty to preserve begin?

It begins when litigation is reasonably anticipated, not when a complaint is filed. 

What is the difference between the duty to preserve and a legal hold?

The duty is the legal obligation to protect evidence. A legal hold is the process a party uses to meet that duty.

What happens if a party fails to preserve evidence?

Failure can lead to spoliation sanctions. These range from curative measures to adverse inference instructions or dismissal of the case.

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