Any business information system will have two critical components: a computer network and a database system resided on the computer network.

Many business related data (such as customer records, business financial data, company's documents, employees' records, etc.) are stored in the databases so that they can be shared among different users. Users can query databases to get the data and information they need.

In 200 to 300 words, discuss the following:

1. Why database system is a critical component of business information systems?

2. Why IT department of a company needs to backup databases regularly?