This is a major concern for clients – and one that is easily overcome. Most VAs are already using secure email addresses rather than gmail or yahoo etc. You also tend to be registered for Data Protection and known what your responsibilities are in keeping client data safe. You may also have additional security built into your systems such as cloud storage/back up, a system of work which separates client files, confidentiality agreements or additional firewalls and security on your computer. Tell your clients about them!