Explanation
Cloned objects are replicated physically rather than logically to secondary databases. That is, cloned tables in a standard database do not contribute to the overall data storage unless or until DML operations on the clone add to or modify existing data. However, when a cloned table is replicated to a secondary database, the physical data is also replicated, increasing the data storage usage for your account.
https://docs.snowflake.com/en/user-guide/database-replication-considerations.html#:~:text=Replication%20and%

Explanation
Materialized views require Enterprise Edition. To inquire about upgrading, please contact Snowflake Support
https://docs.snowflake.com/en/sql-reference/sql/create-materialized-view.html#:~:text=Materialized%20views%

Explanation
Semi-structured
JSON, Parquet
https://docs.snowflake.com/en/user-guide/data-unload-prepare.html#:~:text=Supported%20File%20Formats,-Th