Use the Bucket Lock feature to set the retention policy on the data.

Run a scheduled job to set the storage class to Coldline for objects older than 14 days.

Create a JSON Web Token (JWT) for users needing access to the Coldline storage buckets.

Create a lifecycle management policy to set the storage class to Coldline for objects older than 14 days.

Create a lifecycle management policy to set the storage class to Nearline for objects older than 14 days.