Archive logs: When a real-time log file in Archive has been completely inserted, that file is compressed and considered to be offline." https://docs.fortinet.com/document/fortianalyzer/7.4.3/administration-guide/381919/logs

Reference:
2300_Reports/0010_Predefined_reports.htm#:~:text=FortiAnalyzer%20includes%20a%20number%
20of,create%20and%2For%20build%20reports.&text=A%20template%20populates%20the%20Layout,that%
20is%20to%20be%20created.
https://help.fortinet.com/fa/faz50hlp/56/5-6-2/FMG-FAZ/2300_Reports/0010_Predefined_reports.htm

FortiAnalyzer allows you to export reports to a variety of formats, including CSV (comma-separated values) format, which is useful for situations that require further analysis of data in spreadsheet software.

Log Data Sync provides real-time log synchronization to all backup devices. - Log Data Sync in FortiAnalyzer HA setups is designed to ensure that all backup devices in the cluster are kept up-to-date with real-time log data from the primary device. This synchronization helps maintain log integrity and availability even in the event of a primary device failure.
With Initial Logs Sync, when you add a unit to an HA cluster, the primary device synchronizes its logs with the backup device. - When a new unit is added to an HA cluster, Initial Logs Sync is crucial to ensure that the new unit starts with a complete set of logs. This process involves the primary device synchronizing its existing logs to the newly added backup unit, which ensures consistency across the cluster.