You can confirm that the vSAN has encryption enabled by navigating to Nodes> Node 1> Drives and then double-clicking on the first drive in the list. There is a checkbox for encryption. If it is encrypted, it will be checked.
Encryption for the vSAN is configured during the initial installation only.
System startup on an encrypted system can be configured 2 different ways.
Default encryption is set for all snapshot synchronizations through a site-sync. Information about encrypting a Site Synchronization can be found in the inline help within the category titled, Site Syncs, under the section labeled 'Creating Outgoing Sync.'
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