Nice work Tom. Personally I am not sure if I would trust a storage provider without any imprint and a registered company. (btw the website is not gdpr compliant...)
In addition, the ToS make me afraid using your service as a backup solution :-)
"ExtraLayer.eu may cancel or suspend your access to ExtraLayer.eu services at any time and for any reason without notice. Upon cancellation or suspension, your right to use the service will stop immediately. You may not have access to data that you stored on the service after we suspend or terminate the service. "
anyway, good luck with the project.