Troubleshooting Tip: Backup file not seen in USB after upgrade to v7.4.10 and above (not v7.6)

Description

This article describes an issue observed in files backed up to a USB.

Scope

FortiGate v7.4.10, v7.4.11, v7.4.12.

Solution

Before v7.4.9, it was possible to carry out a configuration backup in the following ways.

1. Method 1 - Using the GUI: When doing so, it is necessary to enter the 'Filename' and no extension was required.

The backed up configuration file was possible to view using the following command:

execute usb-disk list

In this scenario:

FG6H0F-1 # execute usb-disk list 
2026-06-23 01:50:44         729515      myconfig.conf
2026-06-22 01:06:32         334585      test 333.conf
2026-06-22 01:11:48         334585      test5555.conf

2. Method 2 - Using the CLI with the following command:

execute backup full-config usb config-%%date%%.cfg

Since v7.4.10 to v7.4.12, it has been observed that once backed up, the config file was not listed under the output of the 'execute usb-disk list' command.

As a workaround, it is possible to action the following.

1. In the GUI, add the '.conf' extension.

2. In the CLI - Instead of using '.cfg', use '.conf'.

execute backup full-config usb config-%%date%%.conf

Note: This issue is not present in v7.6.x.