Hi Paul,
Your app is not available due to a site-wide outage in Europe. This is due to a ransomware attack we were a victim of Friday last week. We provide daily updates on restoring the cluster and all the apps in it via our Slack channel:
Slack
Additionally, this was discussed in our support forum:
Https://eu-develop.backendless.com/ is down? - #5 by stanislaw.grin
My data is lost
More information about the attack, in general, is covered in the news:
Hackers exploiting two-year-old VMware flaw to launch large-scale ransomware campaign • TechCrunch
Massive ransomware attack targets VMware ESXi servers worldwide | CSO Online
We anticipate the have the service restored early next week.
Regards,
Mark