You may first configure so called "super user", then use it to change permissions to the "archive" folder / remove it from the client system with this share mounted.
Details are in "ACL Basics" pdf file in the attachment.
Regarding your other attempts: as DSS is a UNIX-like system under the hood, some usernames are not allowed to be used, for example "root". Also, logging into the system via CLI similar to regular UNIX-like is not possible. You may, however, use ssh/putty to access the system's predefined functionality via API/CLI. API will allow you to automate some tasks using external scripts, while CLI is the equivalent of WebGUI, allowing you to change most of the options from within console. Please note that the console available via remote SSH CLI session is the same one you can see on a local display attached to the node.
More information about this functionality can be found here:
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