BA, NHS and county councils are still today experiencing IT downtime out of their control and beyond reasonable expectations. Many companies are either slow or reluctant to use their Disaster Recovery solutions at the point of failure. BA decided against using their DR solution following a power surge and instead tried to restore power to production systems as their primary strategy. BA and SSP were in for a nasty surprise when it took around 3 weeks to unpack all of the customer data and get it restored. Data volumes and bandwidth restrictions have a big impact on replication and recovery times.”]
Source: https://www.csoonline.com/article/3205248/6-reasons-why-it-recoveries-fail.html