https://kb.fortinet.com/kb/documentLink.do?externalID=FD46446#:~:text=On%20FortiAnalyzer%2FFortiManager%20devices%20that,to%20exchanging%20the%20hard%20disk.
If a hard disk on a FortiAnalyzer unit fails, it must be replaced. On FortiAnalyzer devices that support hardware RAID, the hard disk can be replaced while the unit is still running - known as hot swapping. On FortiAnalyzer units with software RAID, the device must be shutdown prior to exchanging the hard disk.

https://fortinetweb.s3.amazonaws.com/docs.fortinet.com/v2/attachments/6d9f8fb5-6cf4-11e9-81a4-00505692583a/FortiAnalyzer-6.0.5-Administration-Guide.pdf page 119 There is an option for "uploading reports to server" under configuring the output profile. The available options are: SFTP, FTP and SCP. You have to be careful on the question itself. The question tells you to "upload reports to a server (external server). Which means, a server has been configured already in this case prior to enabling the "upload reports to server".

https://help.fortinet.com/fmgr/50hlp/56/5-6-1/FMG FAZ/1100_Storage/0017_Deleted%20device%20logs.htm
https://docs.fortinet.com/document/fortianalyzer/6.2.5/administration-guide/87802/automatic-deletion