Longhorn can backup to AWS S3.

Instructions can be found here.

Current backup target is s3://backups.jointcyberrange.nl@eu-west-3/.

A Kubernetes secret aws-longhorn is used. 

kubectl create secret generic aws-longhorn \
--from-literal=AWS_ACCESS_KEY_ID=<XXX> \
--from-literal=AWS_SECRET_ACCESS_KEY=<xxx> \
-n longhorn-system