Supportability, you need to process requests to delete personal data

Maintainability, you need to update software systems to have the newest updates and

patches

Storage curation, you need to keep all collected data to fulfill further deletion requests

Purpose limitation, you are not free to reuse personal data

Lawfulness, you need to have a legal agreement before processing

Data minimization, you should not collect more personal data than needed

Storage limitation, you should not store personal data longer than needed

Decidability, you need to be able to decide on your data