Below I have 3 questions , write a discussion for 250 words individually for each question and give two replies to each one of them 1)Describe the best practice to employ to mitigate malware effects on a machine. 2)Much has been made of the new Web 2.0

Below I have 3 questions , write a discussion for 250 words individually for each question and give two replies to each one of them 

1)Describe the best practice to employ to mitigate malware effects on a machine.

2)Much has been made of the new Web 2.0 phenomenon, including social networking sites and user-created mash-ups. How does Web 2.0 change security for the Internet? How do secure software development concepts support protecting applications? 

3)Describe and discuss at least two backup strategies. Discuss the use of cloud backup strategies, as well?