$5 for 250GB of storage and then $20 per TB ($0.02/GB) after that seems a bit steep.
Plans and Pricing
The base rate of a Spaces subscription is $5/month and gives you the ability to create multiple Spaces.
The subscription includes 250 GiB of data storage (cumulative across all of your Spaces). Additional storage beyond this allotment is $0.02/GiB. If you cancel your subscription by destroying all your Spaces, your bill will be prorated hourly.
I don't know what Hetzner is, but if rsync is available, it's a much better option, particularly if you can do incremental syncing you can get a fairly robust setup with very little code.
The BX30 in 7.90 before any country specific tax. But that is the 1tb price as the price per TB is discounted by volume (and you get more snapshots, etc.)
