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3. depends what wallet you use. If use the wallet I linked then you must backup the wallet.dat. You also must backup the wallet.dat if you use Native Mode in Agama Wallet
4. Yes, you must use Agama Wallet and login with that seed, and it will generate the KMD address from that seed.
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I made backup of Komodo seed and wif-key in Agama application (Basilisk mode). Now can I sleep peacefully?