Google Drive and its BAA protects your files only when they are stored on Google’s cloud.
When Drive syncs files to your devices, those files are unencrypted—and aren't covered by the BAA.
If you lose a device that has PHI synced to it, this could be a HIPAA breach. Additionally, Google does not provide a full audit trail that shows file access by users on devices, which is another key element of HIPAA compliance.
Sookasa and its BAA enables you to get the most out of Google Drive's features by encrypting data at the file-level, so your files remain protected—and audited—on the cloud and synced to your devices.