Hi,
All data that Altavault ingests must go to either a public or a private cloud, Altavault does not support non-cloud replicating scenarios such as "local only"
But you can configure the eviction policy in a way that data is never evicted from the Altavault cache, that option is called Pinning
See TR-4427-1117 for the Share Management options: A SMB/NFS share can be configured with: