It's almost time for the iOS 12 release and while I think that Shortcuts is going to be a separate app in the App Store to update to from Workflow, backups are a good idea. Of course backing up your device is a good idea, but it certainly wouldn't hurt to do a separate backup of your Workflows or Shortcuts that you've created - and maybe it's time to clear out your collection and start afresh (speaking as someone with over 800 Shortcuts, it's definitely time!).
I've created both Workflows and Shortcuts to do this for you, the Shortcuts shortcut is designed to be run on each of your devices - while iCloud Sync should be working now, some of us with extremely large libraries have had the syncing get a little stuck.
Essentially all this does is grab all of your Workflows and create a zip of them in iCloud Drive, the date and time you run the automation is included in the file name, and the Shortcuts variation also includes your device name.
Backups are good, and even if everything goes perfectly on Monday, which I'm sure they will, you won't regret it!
Keep on automating.
Download the Workflow
Download the Shortcut