"Last Sync" is the latest successful synchronization, or update, to the database. It doesn't really tell you what it successfully updated, just that it updated something.

What does last synced on an email mean?

Sync or data synchronization is the process of backing up the data from a device or local storage, be it emails, photos, videos, or even calendar events. ... At the same time, sync also means that emails stored in the cloud server of an email service provider are available in the device for offline use.

Should I turn sync on or off?

If you are using Enpass on multiple devices, then we recommend enabling sync to keep your database updated across all your devices. ... Also, you don't need to worry about the safety of your database as using sync is safe. Your cloud always contains a copy of the same encrypted data as on your device.