The type of backup that should be completed FIRST after installing a new backup and recovery system is a full backup. This is because a full backup is a complete backup of all data and is the foundation for all other backups. After a full backup is completed, other types of backups, such as differential and incremental backups, can be performed.

Since both developer mode and the ability to install apps from unknown sources are enabled, the technician should check for Malicious applications (Option B). Unknown sources can allow unverified apps that may include malware or apps that use excessive background data without the user's knowledge. Checking for malicious apps is essential in this scenario.
* Storage cache (Option A) would not typically cause high data usage.
* Privacy settings (Option C) control data sharing and permissions but don't directly impact data usage.
* Permissions (Option D) might help identify apps using data, but the focus should be on apps that could be malicious.
CompTIA A+ Core 2 References:
* 2.7 - Explain common methods for securing mobile devices, including detecting and preventing malware.

certmgr.msc is a tool that can be used to troubleshoot issues with PKI (public key infrastructure) on a Windows machine. It allows a system administrator to view, manage and import certificates, as well as check their validity, expiration and revocation status. msconfig.exe, lusrmgr.msc and perfmon.msc are other tools that can be used for different purposes on a Windows machine, but they are not related to PKI. Verified References: https://www.comptia.org/blog/what-is-certmgr-msc https://www.comptia.org/certifications/a

For ensuring data protection against local natural disasters and hardware failures, the best approach is to use an off-site solution that provides redundancy and is resilient to local disruptions.
* Using an agent-based cloud backup solution: This method involves backing up data to a remote cloud server, providing protection against local disasters like floods, fires, or hardware failures since the data is stored off-site and can be accessed from anywhere.
* Implementing a grandfather-father-son backup rotation: While effective for managing local backups, this method typically involves physical media which could still be vulnerable to local disasters.
* Automating backups to a local network share: This keeps the backups within the same physical location, making them susceptible to local disasters.
* Saving files manually to an external drive: This method is prone to human error and doesn't provide automated or off-site protection.
Reference: CompTIA A+ Exam Objectives [220-1102] - 4.3: Given a scenario, implement workstation backup and recovery methods.

The command cac cor.ptia. txt was issued on a Linux terminal. This command would display the contents of the text comptia.txt.