Just a quick one, as I couldn't find the answer around the internet.
- In Updraft, chose S3-Compatible (generic) storage option
- S3 Access key and S3 Secret Key are obvious enough and are as given by Hetzner. Access Key is the smaller of the two.
- In S3 Location, you just need the bucket name, so that it reads s3generic://mybucketname (i.e. just type mybucketname in the box)
- In the S3 endpoint box, you want just the domain name of the storage server, eg fsn1.your-objectstorage.com
That's it. Hit Test, and away you go.
Backing up from US to Hetzner Germany took about 20 mins for 1.2Gb backup. Slow, but it completed without error.