Question: In Backup NOW, I have a choice to select 'Format 1' or 'Format 2' as my writing format - what is the difference? Answer: The main difference between these two formats is the writing speed. Format 2 is much faster, yet will not work with all drives. Format 1 is more universally compatible, yet it is slower. For optimum performance, try Format 2 first, and if you receive writing errors then switch back to 'Format 1'.