I have a Personal vault and a Primary vault on my Mac. Can I delete my Primary vault?

I think my Primary vault was created a long time ago, with a previous version of 1Password. The Primary appears to have old information. My other devices iPhone and iPad only have Personal vaults. Are the Personal vaults connected and synched? As I recall the Personal vault might be stored on the 1Password computers rather than iCloud, but I'm not sure. Do I need the Primary vault? Can I delete the Primary vault and create a new Primary vault as a backup on my Mac?

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