I see the menu item “backup”, but, where is it backing up to? And since I have to get a new computer, I will have to reinstall emclient; then how do I restore those local folders?
Backups are saved by default to the …\Documents\eM Client\ folder.
To move to a new device, and take eM Client with you, please see: New device and eM Client? No problem! | eM Client