RAID level affects how much disk space is reserved for redundancy and fault tolerance. For example, RAID 1 mirrors data, meaning you need more space for redundancy, while RAID 5 or RAID 6 reserves space for parity.
Disk size directly influences the total available and reserved space since the larger the disk, the more space may need to be reserved for system functions, logs, and other operations.
The total quota and license type do not directly impact the reserved disk space, though they do influence other aspects of capacity and functionality.

FortiAnalyzer allows for the inclusion of existing reports in the backup files, providing a comprehensive backup of configurations and data. Additionally, the backup files can be configured to be uploaded to SCP and SFTP servers, ensuring secure transfer and offsite storage of backup data. This can be configured both in the GUI and the CLI, providing flexibility in how backups are scheduled and managed.
Reference: FortiAnalyzer 7.4.1 Administration Guide, "Scheduling automatic backups" section.

FortiAnalyzer_7.0_Study_Guide-Online.pdf page 121: The logfiled process enforces the log file size and is also responsible for disk quota enforcement by monitoring the other processes.