No snapshots menu for imported clusters

I’ve noticed that for clusters provisioned from rancher, under ‘Tools’, there’s a ‘snapshots’ menu where you can take snapshots, backup/restore snapshots, while there are no such options for imported clusters.
My question is
how do I have that option for imported clusters?
I am also curious about the differences between imported cluster and the clusters provisioned from rancher assuming the imported ones are also built by rke