Version history for brand guidelines

When we update our brand guide, I'd like to see a history of changes.

Requested features:

• See when guidelines were last updated
• Compare current vs. previous versions
• Optionally re-check old content against previous guidelines
• Roll back to previous version if needed

Use case:
We update our guidelines quarterly. Sometimes content was correct under the old guidelines but fails under new ones. Would be helpful to track this.

Anyone else need version history?