Does KasVault store my Kaspa?

No — KasVault itself does not store your Kaspa. Your Kaspa is not stored in the Ledger device either; instead, it lives on the blockDAG as a UTXO (an unspent transaction output). When you send Kaspa to the address you generate with KasVault, that balance is recorded directly on Kaspa's blockDAG, not inside any app or hardware device. KasVault and Ledger are tools for managing the keys that prove you own those UTXOs — losing access to your keys means losing control of your Kaspa, even though the coins themselves remain on-chain. Understanding this distinction matters because it clarifies that no wallet app is a custodian of your funds; the blockDAG is.