Hello,
I have a problem with Joomla 5. I use Admin tool to backup with cron task in command line.

But there is an issue due to Acym code. When i try to backup with cron, i have :
Symfony\Component\ErrorHandler\Error\ClassNotFoundError^ {#644 #message: """ Attempted to load class "JPlugin" from the global namespace.\n Did you forget a "use" statement? """ #code: 0 #file: "./web-ressources/plugins/system/acymtriggers/acymtriggers.php" #line: 11 trace: { ./web-ressources/plugins/system/acymtriggers/acymtriggers.php:11 { require_once^ › › class plgSystemAcymtriggers extends JPlugin › { } ./web-ressources/libraries/src/Extension/ExtensionManagerTrait.php:217 { …} ./web-ressources/libraries/src/Extension/ExtensionManagerTrait.php:160 { …} ./web-ressources/libraries/src/Extension/ExtensionManagerTrait.php:99 { …} ./web-ressources/libraries/src/Plugin/PluginHelper.php:232 { …} ./web-ressources/libraries/src/Plugin/PluginHelper.php:192 { …} ./web-ressources/libraries/src/Application/ConsoleApplication.php:255 { …} ./web-ressources/cli/joomla.php:77 { …} } }

From a post in the Admin Tool (https://www.akeeba.com/support/akeeba-backup/39673-cron-service-error-255.html), is seem you have to modify your code...