There are 2 ways to backup your Lumi Wallet:

1. With a 12-word mnemonic phrase

To get your backup phrase, go to the sidebar (you can find the icon in the top right corner) and press "Backup wallet". You will see 12 words one by one. Write a copy of each of these words carefully. You will then be required to retype all 12 words in the same order they appeared in to check the status and completeness of your backup. Store your copy of these 12 words (mnemonic) in a very safe and secure place, and never give it to anyone you don’t want to have access to your funds.

Never switch your wallet without having a Backup. The only way to get access to your funds is through your 12-word Backup Phrase.

2. With a wallet file (available only in the web version).

When you create a new wallet in the web interface, the system offers you to download your wallet file and enter your password. The wallet file contains encrypted information about your private key, so it is important to keep it in a safe place.