I cannot backup my configuration file more than once.
Error message: "Operation limit!! please retry after 534 seconds"
Because of lack of resources a threshold has been set regarding manual backup succesive operations. You should wait 10 minutes (600 seconds) between these kind of operations in order for them to be successful.
This error message is generated because the device doesn't have enough resources to undergo succesive backup operations. this is why the "Operation limit" error is generated.