If Tresorit is your current encrypted file-sharing service, test a replacement with the actual collaboration and recovery path, not only an upload speed chart.
Create a non-sensitive folder, share one file with a colleague, revoke access, and verify what remains available in their downloaded or offline copy. Test version history, mobile access, external recipients, admin controls, and a restore after deleting a file. Export the folder tree and confirm names, dates, and permissions or links that will need recreation. Review who holds encryption keys and what happens if an account or recovery credential is lost.
An encrypted service cannot retroactively remove copies someone has downloaded. Document that boundary and keep the old workspace until a sample restore and external-share workflow pass.
Akousa