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when an organisation has a 'link' between 2 offices, e.g. a primary site with its core data centre, and a DR site whereby backups are written (or site resilience with 2nd infrastructure) to a DR site for disaster recovery etc, what actually constitutes that link, in terms of physical materials? And more importantly. kind of events/issues could break that link, leaving the primary site as a single point of failure, and what contingencies should organisations have in place for the event of the link breaking for whatever reason? I appreciate issues like earthquakes can damage physical infrastructure, but then smaller businesses only have so much budget for DR and 2nd sites etc etc.
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when an organisation has a 'link' between 2 offices, e.g. a primary site with its core data centre, and a DR site whereby backups are written (or site resilience with 2nd infrastructure) to a DR site for disaster recovery etc, what actually constitutes that link, in terms of physical materials? And more importantly. kind of events/issues could break that link, leaving the primary site as a single point of failure, and what contingencies should organisations have in place for the event of the link breaking for whatever reason? I appreciate issues like earthquakes can damage physical infrastructure, but then smaller businesses only have so much budget for DR and 2nd sites etc etc.

site links for DR purposes

Disaster Recovery is the planning for and creation of policies and procedures related to the resumption or continuation of an organization's functions following a catastrophic event. The term is most frequently used in relation to failure of networks, but DR preparations also include other business systems and personnel considerations.

Disaster Recovery

Networking is the process of connecting computing devices, peripherals and terminals together through a system that uses wiring, cabling or radio waves that enable their users to communicate, share information and interact over distances. Often associated are issues regarding operating systems, hardware and equipment, cloud and virtual networking, protocols, architecture, storage and management.