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The current features in RKE2 allows you to take snapshot either periodically or on-demand and uploads them to only one s3 bucket that you define through the parameters https://docs.rke2.io/backup_restore/#s3-compatible-api-support However you can simply run the command twice with different buckets to upload them, but I am afraid that they won't be exactly the same snapshot due to time differences

And there’s no way to configure this via the RKE2 cluster config

There is, you can use the same options in the rke2 cluster config file:

cat /etc/rancher/rke2/config.yaml

etcd-s3: true
etcd-s3-endpoint: ...
...

For adding multiple snapshots?

no thats not possible at the moment

I'm curious about the use case for this. Is there something that you couldn't accomplish with s3 bucket replication?

We have to run an extra process to replicate 2 buckets and we'd much rather just have it happen when the backup is taken instead of having another process monitor the bucket and sync changes to a 2nd bucket.