Does copying files to a new folder change the metadata, and how do I collect documents without spoiling the metadata?

Short answer: yes, ordinary copying can change metadata

Metadata is the data about a file: who created it, when it was last modified or accessed, where it lived, and system details the application records. Some of this is stored inside the document, but much of it lives in the file system and is not part of the file’s content.

When you drag-and-drop a file into a new folder, or copy it across drives, the operating system often updates “date created” or “date accessed” to the moment of the copy, and it may strip or rewrite the file’s path and folder context. Opening a document in its native application can update “last modified” or “last printed” values. The visible content may look identical while these forensically important fields quietly shift.

How to collect without spoiling metadata

The goal in e-discovery is a defensible, repeatable collection that preserves the evidence as it existed.

• Don’t browse-and-copy. Avoid using normal file-manager copy, email forwarding, or “Save As” to gather custodial data.
• Use forensic or metadata-aware methods. Tools and processes designed for collection capture the file plus its metadata and generate hash values (digital fingerprints) so you can later prove nothing changed.
• Hash and verify. Recording a hash at collection and re-checking it lets you demonstrate integrity end to end.
• Document chain of custody. Log who collected what, when, from where, and how, in a written record.
• Preserve in place first. Issue a litigation hold and suspend routine deletion or auto-archiving before collecting, so nothing is altered or lost while you plan.
• Collect at the source. Pull from the original system or a forensic image rather than from a copy of a copy.

Why it matters

In U.S. federal civil cases, parties have duties to preserve relevant information, and failing to take reasonable steps can carry consequences. Rules and standards vary by jurisdiction (state courts and other countries differ), so confirm your obligations. When in doubt, involve a qualified forensic or e-discovery professional before touching the data.

For more, see e-discovery topics.