Updating documentation: original document

[pzermoglio]

When updating a given document, should it be a pre-requisite that the original document (or the immediate previous version if there are more than one) be available in the same repository for reference?

[kcopas]

I don't believe so. See item #2 here.

Maintain the chain of provenance in Document control and link to the original source using a persistent identifier.

In the case of digital documentation going forward, users will be able to roll back to previous releases (provided that we mark them as such).