Whereas a contract spells out general terms and costs for services, the SLA is where the real meat of the business relationship and concrete requirements come into play. The SLA spells out in clear terms the minimum requirements for uptime, availability, processes, customer service and support, security controls and requirements, auditing and reporting, and potentially many other areas that define the business relationship and the success of it.

In order for any archiving system to be deemed useful and compliant, regular tests must be performed to ensure the data can still be recovered and accessible, should it ever be needed, for the duration of the retention requirements.

Explanation
Portability is the ease with which a service or application can be moved between different cloud providers.
Maintaining portability gives an organization great flexibility between cloud providers and the ability to shop for better deals or offerings.

Explanation/Reference:
Explanation:
The TLS handshake protocol is what negotiates and establishes the TLS connection between two parties and enables a secure communications channel to then handle data transmissions. The TLS record protocol is the actual secure communications method for transmitting data; it's responsible for the encryption and authentication of packets throughout their transmission between the parties, and in some cases it also performs compression. Negotiation and binding are not protocols under TLS.