On the Passwords page of the Options window (accessible from the File, Options menu item) you can configure how the passwords used in Backup4all will be stored.
Password storage
Store the password in the local Windows account
The passwords will be stored in local configuration files and retrieved automatically when executing an action. The passwords could be retrieved if your Windows account gets compromised. No passwords are stored in the destination folders.
Protect the stored password using a master password
The passwords will be stored in local configuration files encrypted using a master password and retrieved automatically when executing an action. You will have to enter the master password only when you start the application or when the first backup job starts. No passwords are stored in the destination folder.
Do not store passwords
The passwords will not be stored anywhere. You will have to enter the passwords everytime a job action starts. This is the most secure option.