Security information and event management (SIEM) software provides a centralized repository for logs, audit events, and security device alerts to detect and notify admins of suspicious activity.
For example, attackers can enable a backdoor on a compromised device that will provide them with undetected access for long periods of time; this problem is often solved by applying patches, but SIEM solutions may detect repeated abnormal login times to a server.

Explanation
This is the most likely cause of the issue because firewall rules can block or allow traffic based on source, destination, port, protocol, or other criteria. If the firewall rules are not configured properly, they can prevent remote users from accessing the cloud application server, while allowing on-site users to access it. References:
https://docs.microsoft.com/en-us/azure/virtual-network/security-overview

Deploying a virtual machine from a template creates a virtual machine that is a copy of the template. The new virtual machine has the virtual hardware, installed software, and other properties that are configured for the template.

Application consistent backup is a method of backing up data that ensures the integrity and consistency of the application state. It involves notifying the application to flush its data from memory to disk and quiescing any write operations before taking a snapshot of the data. If the databases were not backed up to be application consistent, they might contain incomplete or corrupted data that cannot be restored properly.
Reference:
CompTIA Server+ Certification Exam Objectives1, page 12
What is Application Consistent Backup and How to Achieve It2
Application-Consistent Backups3