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We use google cloud and managing the backup persistent disks is not a huge burden but still less than ideal. Google cloud storage offers s3 compatible storage, but we would need to know how to provide their endpoint in the URI.
You're interested in backing up to a google cloud storage that is similar to S3? Right now we only support s3 and file. Does providing a file location to Google's storage option work?
Which google storage are you hoping to use that is similar to S3? We can review to see if we can provide that option as a target for backup.