You can remove duplicate SharePoint files before migration by using a migration solution with a built-in deduplication engine. The SysInfo Microsoft SharePoint Migration Tool can scan SharePoint content and identify duplicates using file content/hash or file name matching. You can further narrow the scan by file type and creation-date range, then review the duplicate groups before deciding which files to retain.
For example, you can choose to keep the latest or oldest version, depending on your migration requirements. The tool provides a duplicate report showing scanned files, duplicate groups, files to delete, and files to keep. This helps clean the source environment before transferring data to the destination tenant, reducing storage usage, migration volume, and unnecessary duplicate content.
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