Any “S3-compatible” cloud service can be configured using:
Backup and Restore > Cloud Storage Providers
Use “Amazon S3”. Despite the name, it can be used with any “S3-compatible” service.
When configuring, adjust “S3-compatible server hostname” from “Use Amazon S3” to the hostname of the provider you are using.
I’ve personally tested this against “DigitalOcean Spaces” which is S3 compatible.
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