Planning to migrate your ADA to another address after the snapshot?
Thinking of transferring your ADA to a paper/hardware wallet or some other address after the snapshot is done?
Don't throw away the seed phrase you used to access your ADA on testnet
It is highly likely that when your staking rewards are credited on shelley mainnet they will be credited to the same address you used on testnet. So you'll probably need to use that testnet seed phrase again to access your rewards balance.