>I would prefer to use a tool like rsync (and not an inflexible closed source GUI). So, things like Box don't appeal to me. The good news is that there is a to

>I would prefer to use a tool like rsync (and not an inflexible closed source GUI). So, things like Box don't appeal to me. The good news is that there is a tool for this: rclone https://rclone.org/docs/ https://rclone.org/docs/ It's basically rsync for cloud services and even supports your example of the Box cloud service. You can do a lot of neat things with rclone like transparent encryption and even turning a cloud storage into a mounted local storage folder. The other option would just be something simple like a RasPi or similar miniPC with a pair of HDDs mirrored, either automatically or manually by just backing up to both, or having the pc copy one to the other, with some retention rules etc. Honestly for important data I would do both a cloud backup and local, unless you have too much data where cloud would be too expensive. In that case just keep the most important stuff in the cloud and keep that and the less important stuff local.