Duplicity is not available for Windows but there are plenty of alternatives that runs on Windows with similar functionality. The best Windows alternative is Duplicati, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 25 alternatives to Duplicity and 13 are available for Windows so hopefully you can find a suitable replacement. Other interesting Windows alternatives to Duplicity are CrashPlan (Paid), Duplicacy (Freemium, Open Source), Veeam Agent (Freemium) and Bareos (Free, Open Source).
Rebel Backup lets you make encrypted backups of your important files offsite to Dropbox or Google Drive. You control what and how often is backed up, and the encryption happens locally on your computer.
Stellar Insta Backup is a Windows data backup software to create full volume backup or backup of selected files and folders. The tool facilitates different types of data backups; such as full backup, differential backup, and incremental backup.