I do not want Galaxkey Synchronization and Sharing, just want to secure my local files and email communication, can I do it ?

Yes, Galaxkey allows you to use it locally without cloud synchronisation and sharing. This can be configured for identities by following these steps

1. Login to https://manager.galaxkey.com using the identity that you want synchronisation to stop.

2. Click on "Configuration" option

3. Uncheck "Enable Galaxkey Secure Share File Synchronisation" in the Galaxkey secure share section.

4. Restart Galaxkey for windows on your machine. It will now stop synchronisation and sharing with other users. 

Note: You will not be able to get the files shared with you till you enable synchronisation and sharing in Galaxkey for windows.