Data Storage
One of users’ major concerns is that they have no
control over the location of data or how it’s stored.
Users rely on services that are opaque to them, and
no information about the server’s operation is divulged.
Although this can improve security by obscurity,
it also undermines user trust. How the data
is protected on the server side might not be clear to clients.
Data retention is also a concern for users. The
cloud service provider might keep deleted data in
backups or for some unpublished reason. For example,
Facebook kept deleted data but removed it from
view. The same concerns also apply when a service
is terminated.