Data loss is an error condition in information systems. This can occurs when valuable and sensitive information on a computer is compromised due to theft, human error, viruses, malware, or power failure.
Data backup is one of the method to prevent data loss and it is the process of copying or archiving of data to another location for the purpose of being able to restore them in case of data loss.
DMARC is known to be as domain-based message authentication, reporting and conformance, which is the latest advancements in the email authentication.
Everyday security engineers/researchers are discovering lots of new exploits, vulnerablities and other security bugs in softwares and we have to install/patch the application if the new exploit is critical before an hacker use it.
Sender Policy Framework or SPF is an email validation mechanism to detect and prevent email spoofing. An administrator can specify the mail server name or list of servers from which mails will be sending for that domain in its DNS record.