87To the extent that the purpose of that expedited retention no longer corresponds to the purpose for which those data were initially collected and retained and since any processing of data must, under Article 8(2) of the Charter, be consistent with specified purposes, Member States must make clear, in their legislation, for what purpose the expedited retention of data may occur. In the light of the serious nature of the interference with the fundamental rights enshrined in Articles 7 and 8 of the Charter which such retention may entail, only actions to combat serious crime and, a fortiori, to safeguard national security are such as to justify such interference, on the condition that the measure and access to the retained data comply with the limits of what is strictly necessary, as set out in paragraphs 164 to 167 of the judgment of 6 October 2020, La Quadrature du Net and Others (C‑511/18, C‑512/18 and C‑520/18, EU:C:2020:791).
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