If I lose my phone, or it gets damaged, or if I lose access to my DAU Vault App, will I lose access to the funds saved in the DAU Key wallet?
Security
No, you will not lose access to your assets. The phone and the DAU Vault App do not store your assets; they simply act as a display for your data. Your card handles the storage of private keys and transaction signing.
Therefore, even if you get a new phone, lose your phone, it breaks, or you lose access to your DAU Vault App, you can still access your wallet assets by using your card on any other mobile device. Simply download the DAU Vault App on your new phone and scan the card, following instructions to "import a cold wallet" to regain access to your funds.