You can't know where you're going until you know where you've been. If you have a long-standing LibGuide, a great way to see how it's changed and will change, over time is by creating an archive. Data Exports is an archive of sorts.
Using Guide HTML backups, you can create a snapshot of your guide over time. Create a new HTML Backup every time you make significant changes.
New HTML Backups in LibGuides v2 do not overwrite the previous backup.