The single biggest point of failure in self-custody is an incorrectly backed-up or invalid seed phrase. A catastrophic error is often discovered too late: when trying to recover funds after a phone is lost. The only way to be 100% certain your backup is correct is to perform a dry-run recovery test. This involves restoring your wallet onto a different device using only your written seed phrase. You can use an old Android phone, a secondary device, or even simulate the process using a compatible software wallet on a desktop computer. The goal is to verify that the restoration process works and that the restored wallet shows the correct public addresses and balance. After confirming, you can simply delete the test wallet. Performing this test with your mycelium wallet backup guarantees that your lifeline works and provides immense peace of mind. It is the most important drill a Bitcoin holder can practice, transforming theoretical security into verified certainty.