Check professional secrecy and sealing before any inspection.
If an authority accesses cloud data containing lawyer communications, the affected person should immediately raise professional secrecy. Section 112 StPO provides special protection for items whose seizure is prohibited because of professional secrecy. Ask for the objection and the affected data set to be recorded in the minutes.
The exact classification may require technical assistance. Preserve the order, account name, period and folder structure. Do not open the files yourself if doing so could change their state or make the scope of the communications unclear.