Move a small, mixed sample of files and personal data into Cozy Cloud. Open it from two devices, edit a document offline if supported by your setup, and confirm the final version is clear. Check sharing permissions and what a guest can access.
A personal cloud should not become your only copy. Export the sample data, restore a backup, and plan account recovery before moving photos or documents that cannot be replaced. Judge it by recovery and day-to-day sync, not the welcome screen.
Akousa