What can be preserved?
Authorized original bytes/reference, exact source hash, reliable metadata, extractable content and explicit conversion evidence.
Forwardable migration brief
Legal operations
Pilot one document family before changing the legal stack.
What cannot be recreated?
Missing history, certain authorship, custody, approvals, identity and semantics.
Safe pilot
Start with 100 representative authorized files, validate exceptions and expand only after reconciliation.
Everything at once?
No. Create new UDs now and migrate selected high-value families gradually.