Since syncing between devices or using the web app requires storing my database on your servers, I’m concerned about the security of my data. Is it encrypted? Or is it possible to point it to other storage, such as a private cloud or Amazon S3?
The data is not stored encrypted, but of course the data is password protected.
It is not possible to point to other storage. Remember that this is not simple file storage, this is actual record level database syncing.