"me too" - rclone with Azure Archive tier for last-resort backups. I like that rclone doesn't tie me to one storage provider, and I'm not sure why anyone would use the linked project over rclone.
- It will not create archives by default, so potentially upload a lot of files (just like rsync). There are a few workarounds in the documentation to mitigate the cost.
- It cannot do restore of Deep Archive data
Edit: Can do restore, but it's a manual step.