Some element in the backup / restore forms can be disabled because they are dependent on other values. 

When a setting is disabled, we should include a hidden form element to pass the value even though the value cannot be changed. The reason is that:

We are viewing the first page of backup

Enrolled users is turned off

Role assignments is now "on but disabled"

We click next

We click previous

We turn enrolled users on

Now - role assignments is "off but disabled"

• The value does not match the form default or the previous value.