Duplicacy is a lock-free, cloud-native backup tool with a web UI. Supports multiple storage backends (S3, Backblaze, SFTP, local disk) with deduplication and encryption. Free for personal use.

A lock-free, cloud-native backup tool with a browser-based management interface. Configure backup jobs, manage storage backends, and monitor backup status from your browser.
Open your domain to access the Duplicacy Web UI. On first launch, you will be prompted to set up an admin password and configure your first backup repository.
Free for personal use -- GitHub