Is there anyone here whose site has already been restored?
As workaround, you can use the code from revisions in database to make a old version accessible, then export this page as .txt, build an new page in ja_builder and import the .txt.
Attention, your header and footer are lost and must be rebuild manually.
I hope there will be a tool from joomlart, thats makes this rebuild easier.
Since my report, no pages are rebuilded yet, so we and our customers are very disappointed.
Joomlart, thats not enough.