For a true , you must deploy a certified third-party archiving solution that stores data in immutable, WORM-based storage, separates administrative roles, and generates legally defensible audit logs.
Third-party archives create tamper-proof audit logs of every search, export, and deletion request. Many also include digital signatures (hash values) per document to prove integrity over decades. Recommended Third-Party Solutions for German Compliance If you need GoBD, IDW PS 880, or GDPdU compliance, consider these established tools: revisionssichere archivierung office 365
Look for solutions that write data to AWS S3 Object Lock or Azure Blob Storage immutable vaults —not just a database flag. These are true WORM systems at the storage hardware level. For a true , you must deploy a