Admin without Data Access


I’m thinking about setting up a NextCloud-Server on my Raspberrie Pi. The cloud shall be used to store data from an association i’m part of.

Now there is one problem: Is it possible to ensure that the admin (my person) has no access to the stored Data of other users?
eg. Data from the associations board I’m not allowed to see?

I’m not planning to read any data which is not for my eyes but the board needs a solution which ensures a high data-security.

Thanks in advance for any answers.