What is the difference between the default key and the user key?

After selecting the default key will be generated automatically and stored in a database on Xopero Cloud servers. The user does not know, so he does not need to worry about its safety. By using the default key user can, via a web panel, download and generate public links to resources sent as a backup. User key provides higher security of your data than the default key is known only user, is not stored on the Xopero Cloud servers, therefore the user duty is to properly secure. In case of loss user key the data sent to servers Xopero Cloud are impossible to recover. By using user key there is no possibility download and generate public links to resources sent as a backup. Regardless of the choice of the encryption key the data are encrypted and decrypted on the user side.