Fortinet FortiAnalyzer 3.0 MR7 - Manual (Page 183)

Managing firmware versions Backing up your configuration
FortiAnalyzer Version 3.0 MR7 Administration Guide
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5 Select OK.
6 Select a location when prompted by your web browser to save the file.
To back up log files using the CLI
Enter the following to back up all log files:
execute backup logs all {ftp | sftp | scp| tftp}
If you are using a TFTP server, you do not need to enter a user name, password
or directory.
After successfully backing up your configuration file, either from the CLI or the
web-based manager, proceed with upgrading to FortiAnalyzer 3.0.