Firewire can help protect your current network from a cyber-attack, or even assist with the aftermath of one.
Business Continuity planning is having a plan in place in case a natural disaster, an accident or serious virus were to happen and all data could be lost. Data on your server or computers that could contain software or files that are crucial to your business would need to be able to be accessed after a disaster.
Varies on size of company, uptime requirements and budget. Typically 1-2 Months