Hi @Rayven01, I'm glad this was helpful! We will of course continue to do everything we can to both make 1Password extremely secure, as well as be deserving of your trust. We certainly don't take the responsibility lightly.
Congrats on your new account - this personal vault you mentioned is the default vault that's created with every new subscription account. We name it personal to distinguish it from other vaults you might create later. Usually when people create additional vaults, it's for some more specific purpose, or to share items with others. We thought it was important to have one place marked personal that is clearly your own, visibly denoting that all the items contained there are for you.
This vault is not a standalone - it's contained within the same encrypted database as your other vaults,* and syncs between your devices via our 1Password.com service.
(That database is locked and unlocked locally, on your device, and it lives in the %localappdata%\1Password\data directory, if you're curious.)
Here's an example of the practical implications of this. 👍 Let's say that you have just set up your new 1Password account on a desktop computer. Great! Now, if you want to access that same 1Password data on a mobile phone as well, all you have to do is install the app on your mobile phone, and sign in with your Account Password and Secret Key.
When you sign into the app on a new device for the first time, it generates a local copy of your database on that device, and all the items you're used to seeing will be present there. You don't have to choose to sync a specific file in a specific directory - just signing into the app is enough. The service takes care of the rest.
Whew. That went longer than expected. I hope this is helpful, and am looking forward to hearing about your experiences with the app from here!