Hi,
If you are using your domain '.local' with the Domain Controller module enabled, no, as soon as you make that change, you will lose all the information (it removes everything and does the provision Domain Controller again).
Also, when you rename the domain name of a Zentyal that is provisioned (using the Domain Controller module), there are issues that ends with a rollback or a fresh installation.
So, if you need to change the domain name, you need to do a fresh installation of Zentyal, and then, import all the users and groups through the feature 'Import/Export'.
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https://doc.zentyal.org/en/directory.html#importing-and-exporting-users-and-groupsHope it helps.
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