The differential backup method would best address these concerns. Differential backups only back up files that have changed since the last full backup, which means that only a few files would be backed up each time.
This would help to mitigate the risk of ransomware attacks, as only a few files would be affected if an attack occurred. Additionally, differential backups require less storage space than full backups.

A sandbox is an isolated environment that allows for the testing of critical systems without the risk of them being negatively impacted by changes. A sandbox can be used to simulate real-world scenarios, experiment with new features, debug errors, or evaluate the performance and security of a system. A sandbox can be created using virtualization, emulation, or containerization technologies. A sandbox prevents any changes made in the testing environment from affecting the production environment, which is the actual system that is used by the end users.
https://www.comptia.org/training/books/a-core-2-220-1102-study-guide

DNS (domain name system) is a protocol that translates domain names to IP addresses. If the computer has an incorrect DNS address assigned, it will not be able to resolve the domain names of web-based applications and access them. A firewall, a VLAN (virtual local area network) and a browser cache are not the most likely reasons for the issue, since the computer can ping known IP addresses on the internet and receive a response.
Verified References: https://www.comptia.org/blog/what-is-dns https://www.comptia.org/certifications/a

When a technician is unable to connect to a laptop over a VPN, one of the most common reasons is that the firewall settings on either the laptop or the network are blocking the connection.
* Wireless protocol: Unrelated, as the technician is already connected to the VPN.
* DHCP pool: Unlikely to be the issue, as it deals with IP address assignment.
* Content filtering: Typically involves filtering web content, not affecting direct connections.
* Firewall: The correct setting to review, as it may block the necessary ports or services required for remote access.
Reference: CompTIA A+ Exam Objectives [220-1102] - 2.3: Given a scenario, troubleshoot common wired and wireless network problems.

NTFS stands for New Technology File System, which is a proprietary file system developed by Microsoft4. NTFS is the default file system for the Windows NT family of operating systems, which includes Windows 10, Windows Server 2019, and other versions5. NTFS provides features such as security, encryption, compression, journaling, and large volume support45. NTFS is not the native file system for other operating systems, such as macOS, Linux, or Android, although some of them can read or write to NTFS volumes with third-party drivers or tools