Given the requirement for storing large amounts of infrequently accessed data, the best choice is moving the data to object storage with a long-term storage tier. Object storage is suitable for unstructured data and can be more cost-effective for infrequently accessed data. This storage type also allows for scalability and the long-term tier optimizes costs for data that doesn't require frequent retrieval. Block storage is typically used for high I/O-intensive workloads like databases and isn't as cost-effective for this scenario. File storage wouldn't provide the same cost benefits for infrequently accessed data compared to an object storage long-term tier. Lastly, hybrid storage would involve a mixture of storage types which may not be necessary and could potentially increase complexity and costs for this specific use case.