How do I back up my emails and calendars from eMCliet?
you can set up an automatic backup in Tools>Settings>General> Backup to backup your whole eM Client database.
This Backup can also be performed manually using the File>Backup… option.
If your gmail accounts are set up using IMAP, make sure to go to Tools>Accounts and check if the option to ‘Download messages for offline use’ is checked under each account’s IMAP tab, or this backup will only save your account setup but not the actual messages (as those are not downloaded to your database).
You can also manually export those data using the File>Export options.