how do i backup private keys of user address which are generated by getnewaddress?

how do i backup private keys of user address which are generated by getnewaddress?

i am working on website which receives and store bitcoins each user will credited with newaddress for deposit BTC how would i take backup of their privatekeys with bitcoind i think bitcoind generate address from key pool which is limited to 100 after that it will generate new key pool what are the best practices to maintain backups

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