Nowadays, numerous users consider that as long as they have installed anti-virus software on their computers and launched it to prevent viruses, realize effective data safety protection can be realized. Actually, it is not enough at all, no matter for small business users or big enterprises. However, many small business owners pay little attention to cyber criminals' hacking deeming that they themselves are not the aim of hacker. Unfortunately, they are on the opposite side of truth. Therefore, it is high time that users realized the importance of data safety and took effective and timely measures to cope with the current situations. During the course of utilizing computers, users must take physical security, network security and computer system security and file security into consideration so as to keep data safe via preventing data loss, data destruction, data disclosure, unauthorized access to data and malicious alter of data content or structure. Data security plays an indispensable role in keeping confidential and vital data safe to protect intellectual property rights and commercial interests. As a result, users should lay great emphasis on keeping data safe like the nature of data and the risks involved. To let users learn more about data safety, we will introduce three aspects. Physical security: 1. The location with vital data, computers, or storage media should not be allowed to get in at random. 2. It is highly recommended users log the removal of and access to media or hardcopy material in store room. 3. Do not transfer data under exceptional circumstances like resorting to professional companies to realize data recovery from a hard drive with confidential significant data since it may leak data. Network security: If users would like to keep data safe, they need to remember the following two points in mind clearly: It is not advisable for users to store confidential data especially those personal information on servers or computers if they have connected the computer to external network. It is suggested users open firewall protection and upgrade relevant anti-virus software to avoid virus attack and malicious decryption. Computer system and file security: 1. Establishing an excellent firewall system and locking this system with a fixed password. 2. Setting up restricted visit access to data files like no access, read only, read and write, or administrator-only. 3. Not delivering private confidential data via emails or other forms without first encrypting them. 4. Wiping the significant data which are not needed any longer but still confidential. 5. Users must keep in mind that sharing services like Google Docs or Dropbox are not safe as expected.