With reliability, I assume you mean protecting channel balances against server failure (Not being able to close the channel correctly following an error).
You can reproduce the wallet in both nodes, but that doesn't contribute to securing a payment channel's balance in the case of a failure. It simply just means both node instances have identical wallet keys.
In other words, the two node instances may be signing with the same wallet keys, but they cannot be operating as a single peer for a given channel.
Since it is the individual payment channel balance (unbroadcasted, signed commitment transactions) which is at risk, it would be necessary to secure the commitment transaction data of a single node instance to protect your balance in case of a server failure.