I've used restic for over four years. It's been rock solid on all platforms (mac/windows/linux). I've set it up on everything from beefy linux servers to 10 year old Windows machines (scheduled job running for 3+ years, pruning on a separate machine, never had any problems). The support for B2 and S3 compatible backends as well as rclone makes it a breeze to set up. The community and maintainers are also very friendly and helpful. Highly recommended!