@simonzerafa

these are not international guidelines, but maybe it is still interesting?

Guidelines of the German data protection commissioner for compliant storage of traffic data:
https://www.bfdi.bund.de/SharedDocs/Downloads/DE/Themen/Telekommunikation/LeitfadenZumSpeichernVonVerkehrsdaten.pdf?__blob=publicationFile&v=1

I don't know if there is an English version? Is there? @bfdi

#DataRetention