I'm responding a little late here, but hopefully you'll still see this. Yes, when you unmount a backend, all the data is deleted. Vault mostly behaves like a f

I'm responding a little late here, but hopefully you'll still see this. Yes, when you unmount a backend, all the data is deleted. Vault mostly behaves like a filesystem, but not in this scenario. The raw data is not preserved. If you want to preserve the raw data, you can remount (move the mount point). We didn't finish it for 0.1, but we already built in secret enumeration into the core. We plan to expose this at some point. If you want to unmount and preserve your secrets, you can always enumerate them and back them up elsewhere (unencrypted). This isn't yet available.