Update snowflake.mdx

@paco-valdez do you have any feedback on this before I copy it to all the data sources? Are info boxes the right thing or should I use a different color for one/both statements?

Author: morgan-at-cube

docs/pages/product/configuration/data-sources/snowflake.mdx

@@ -113,6 +113,18 @@ No extra configuration is required to configure batching for Snowflake.
 Snowflake supports using both [AWS S3][aws-s3] and [Google Cloud
 Storage][google-cloud-storage] for export bucket functionality.
 
+<InfoBox>
+
+Export buckets may be shared across multiple Cube deployments; however, they should not be accessed by external applications or other data sources. 
+
+</InfoBox>
+
+<InfoBox>
+
+To help manage storage costs, it is strongly recommended to configure a retention policy on the bucket, with a duration between 1 hour and 7 days.
+
+</InfoBox>
+
 #### AWS S3
 
 <InfoBox>
@@ -200,4 +212,4 @@ connections are made over HTTPS.
 [snowflake-format-2]: https://docs.snowflake.com/en/user-guide/admin-account-identifier#format-2-account-locator-in-a-region
 [snowflake-docs-azure]: https://docs.snowflake.com/en/user-guide/data-load-azure-config#option-1-configuring-a-snowflake-storage-integration
 [azure-bs-docs-get-key]: https://docs.microsoft.com/en-us/azure/storage/common/storage-account-keys-manage?toc=%2Fazure%2Fstorage%2Fblobs%2Ftoc.json&tabs=azure-portal#view-account-access-keys
-[link-snowflake-quoted-identifiers]: https://docs.snowflake.com/en/sql-reference/identifiers-syntax#double-quoted-identifiers
+[link-snowflake-quoted-identifiers]: https://docs.snowflake.com/en/sql-reference/identifiers-syntax#double-quoted-identifiers