Which two tasks should be done regularly to preserve the security and integrity of data and applications on mobile devices?

Backing up user data on a regular basis is essential for preserving the security and integrity of data and applications on mobile devices. Regular backups ensure that in the event of data loss due to device failure, theft, or malware, you can restore your data to its previous state. This is particularly important for users who rely heavily on their mobile devices for personal and professional use, as losing important files, personal information, or application data can significantly disrupt their activities.

In addition, upgrading the operating system is important for maintaining security, as OS updates often include patches for vulnerabilities. However, while essential, it does not directly address data preservation. Installing antivirus software also contributes to security, but primarily focuses on protection against malware rather than directly preserving data integrity. Downloading random apps poses a risk to data security and should be avoided as it can introduce malware or cause data breaches, directly contradicting the goal of preserving security and integrity.