Why You Should Remove Duplicates Before a OneDrive Migration

Migrating redundant files moves cost and ambiguity into the target. It lengthens transfer and validation, consumes destination capacity, and makes users decide between duplicates after paths and permissions have already changed.

Team libraries need an owner and a decision trail. A byte-identical file may still be required in a separately permissioned workspace, under a retention rule, or as the target of a shared link.

Profile the source first, identify exact groups, and route exceptions to owners. Run a pilot cleanup well before cutover, then rescan or use delta reconciliation so late edits are not judged from a stale snapshot.

Pilot the workflow on a representative scope, record exceptions, and measure false positives before expanding. Business cleanup is safer as a governed series of batches than as a single drive-wide action.

Remove only reviewed redundancy whose keeper will migrate with the required access and history strategy. If the migration tool preserves one item’s metadata better than another’s, that target behavior should influence the keeper choice.

The exported plan should be useful outside the scanner: identify the account and scan, retained items, candidates, evidence, reviewer, and exceptions so another person can audit the decision.