RGPD 2018, or European Data Protection Regulation, is mandatory for all companies engaging with European citizens, under penalty of a fine of 4% of annual turnover. RGPD DEFINITION.
RGPD requires that you be able to put a contact person to sleep, and then be able to reactivate them if necessary.
To do this, go to a Contact ->"Edit Contact" button ->"Archive".
An archived contact can then be put back into production.
To perform this operation, please read this explanation: