SMC's firmware version is V500R002C00SPC600
Logged into the SMC using a admin account “adahel” as shown below:
But there is no feature “ Backup Database key” on the help menu as shown below:
From the tests done to SMC 2.0 even if you make another user with the same rights as Administrator it didn’t show the “Backup Database key”, this is only for the admin user.
Even if the rights are the same:
As below picture:
When backing up the database, use only the "admin" account.