I have had many converations with SQS during 2021. Backup is not supported. And when your site grow, and you therefore may need it the most, you can no longer duplicate your site +100 pages, which is a workaround.
In my experience having had a website at SQS for 6 years, SQS launch things 2-3 years after they have been mandatory for website owners.
As an example
• commerce (came way too late)
• membership functions (also came way too late)
Presently SQS publicly in their guides advise you to export to WP if you happen to need a backup.
SQS also may tell you to trash pages, to get below 100 pages. Then you might think "great should be easy" but what those DEVs working at their office may not know is that this procedure breaks your content such as URL slugs
If you need a backup, of your hard-earned online SQS business, you need to write in your calendar right now the steps required to make the final switch to WP and never look back