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This bugged me too last year. So I built a hosting service for Borg backups that can have append-only access keys.

So the client machine can't change old backups. Ever. In addition you can lock your settings down with 2FA.

Great service, especially with the addition of the monitoring features.

How do you store the data on your end?

Borg stores all data as plain files in 500MB segments. Every segment has a checksum, which you can validate using the `borg check` command.

The actual data lies on a plain vanilla RAID array.

That is going to be an issue for anyone with GDPR data, since you are required to be able to delete it upon request.

You can still use a full access key to prune old data/old archives as needed. But you use it from a trusted machine or temporarily.

Also: you still need to keep some data even under GDPR. Like billing data.