What is the importance of the master system database, Discuss the pros and cons

What is the importance of the master system database? Discuss the pros and cons of full database backup. Discuss all components of the database engine in relation to data availability, and their benefits and disadvantages in relation to server redundancy, database redundancy, and file redundancy. Provide examples to justify your ideas. (50-70 words with reference)

Entities within databases take on many forms. Provide three examples of entities you may encounter and summarize the attributes of each. Explain why entities are important and provide examples to illustrate your ideas. (50-70 words with reference)