Borg Backup 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 10 alternatives to Borg Backup and 13 are available for Windows so hopefully you can find a suitable replacement. Other interesting Windows alternatives to Borg Backup are Restic (Free, Open Source), UrBackup (Free, Open Source), Veeam Agent (Freemium) and DAR (Free, Open Source).
EvaCopy which stands for EVACuate and Copy is one such unique backup solution, that combines versioning in combination with backup for easy restoration. The program is simple to configure and distribute across multiple workstations.
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.