Rogue APs are generally defined as APs that you don't manage but have been connected to your wired network. Obviously this could be a significant security risk. I don't think they're sending deauth messages to every client/AP they see.
How do you know if your backups are good? Better to test a restore when everything is still working fine rather than waiting until you really need it and then finding out that your backups are broken.
https://help.fortinet.com/fos50hlp/54/Content/FortiOS/fortig...