In combination with techniques to minimise easy/unrestricted exfiltration of data. Such as egress filtering, software access policies/controls, minimum privileg

In combination with techniques to minimise easy/unrestricted exfiltration of data. Such as egress filtering, software access policies/controls, minimum privilege, network segregation/isolation, good user access and network access controls, decent patching policy, good and tested backups and incident response plan…yada yada. Make sure if they do get in, the damage is limited.