We also used to store onto discs…. For now we try to write a report in the medical chart for every aEEG assessed (sometimes difficult when longtime monitoring is used during nights and weekends, but I think this is important from the medical-legal aspect (and most recently we are also able to add a screenshot of the trace) and then additionaly store the aEEG trace on a secure (only accessable for medical staff and by password) server for longterm storage.