What would happen if remove containers in UPS connection

We are using SP2013 on-premise. Currently our farm have setup UPS connection to entire domain. Hence, some non-users account like other system's service accounts have been sync and user profiles have been generated.
I think it is not a good security practice and consider remove all unnessary containers in the UPS connection. However it is production environment and I am worry some users' data will be lost.
Will user's user profile lost for following condition?
1. User's container is selected before and after re-configuration
2. User's container is not selected after re-configuration. Later on we select his container back.
3. User account is not within selected container. Later on we place his account back to selected containers.
Thank you!

Hello Mark Lui,
you are completely right - it is not a good security practice to select all containers for User Profile Synchronization Service.
In your case:
1. User profiles will not be affected, no change.
2. If the user container is not selected after re-configuration user profile information will not be available after the next incremental synchronization. But personal sites (MySites site collections) will be available until you delete it manually.
3. In this case user profile will not be available. After adding it to the container that User Profile Service application synchronize and after next incremental synchronization information about the user/account will be available.
Keep in mind that site collections created for the accounts before the re-configuration will be available until you delete them manually. User profiles will be affected with next incremental or full synchronization after the re-configuration. It is also
possible users that are not synchronized to be visible under different scenarios because information about them is also kept in User Information List, which separate from User Profile Synchronization application and is not updated when you delete users/accounts
from AD. You need to delete account from User Information List manually. 
Hope it is more clear now and you will find this one helpful.

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