If you update a document template and save over it, that previous version cannot be retrieved. We can enhance this by using version tracking and keeping previous versions for a short length of time so we can retrieve these if a mistake has been made or a template has been incorrectly overwriten.
This feature is currently being rolled out to users via phased release rings and so individual customers will start to get it over the coming weeks.
Also, at this stage the restore capability is only available to Support users, but all customers will benefit from an automated daily snapshot that our support team have access to.
This would be great to know who changed the document and why. And certainly to be able to roll back if it was done in error.