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Manually attaching volume to a node using Longhorn UI is mostly for debuging and testing purposes. The normal use case is: workload pod that require a PVC provisioned by Longhorn is deployed. Kubernetes will reach out to Longhorn through the CSI mechanism to attach/mount the volume automatically

what happens when that node is lost/rebooted or offline?

Longhorn will auto detach/attach volume when needed. You can you some tests for this case. Please let us know if any unexpected issues.

@famous-journalist-11332 thanks for this information. I have been playing with Longhorn the last few days and I can confirm this behavior. Especially after i change the default storage class to longhorn. Just works. I did however notice dynamic PVC does not seem to be able to be backed up and restored easily (can you possible confirmed this?) i made a backup - that works - when i restore i have to detached the PVC volume and when i do that the POD just creates another PVC. I have to assume that you need to create static PVC's for the restore to work correctly?

Restoring a volume from backup mean create a new volume from the backup. You usually only do this when the existing volume is gone (so you want to store it from backup) or you want to create a new volume with the same content.