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How can adding a new orderer download the ledger as ordering nodes are not connected with each other and Kafka keeps messages only for 7 days.

And also if I shut down an orderer node for more than 7 days and if I bring it up again then it will not find the transactions that happened in those 7 days in Kafka partition, therefore, how will it sync and update it's a local ledger.

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In 1.0, Kafka brokers are to be set with = -1

doing this disables time-based retention and prevents segments from expiring. This means that:
A partition hosts the entire transaction history of the channel.
A new orderer service node (OSN) can be added at any point in time and use the Kafka brokers to sync up with all channels in their entirety.

hope this helps

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