The AWS S3 buckets service is free

Amazon S3

S3 Intelligent-Tiering optimizes storage costs by automatically moving objects between four access levels when access patterns change. There are two low-latency access levels optimized for frequent and infrequent access to save up to 40% on storage costs, and two opt-in archive access levels for asynchronous access with cost savings of up to 95% for objects to which is rarely accessed.

Items uploaded or transferred to S3 Intelligent-Tiering are automatically saved in the frequent access tier. S3 Intelligent-Tiering monitors access patterns and then moves the objects that have not been accessed for 30 consecutive days to the infrequent access tier. Once you have enabled one or both archive access levels, S3 Intelligent-Tiering will automatically move objects that have not been accessed for 90 consecutive days to the archive access level and then to the Deep Archive Access level after 180 consecutive days without access. When the objects are later accessed, S3 Intelligent-Tiering moves the object back to the frequent access tier.

There are no retrieval charges, so you won't experience unexpected increases in storage costs as access patterns change. Learn more about optimizing storage costs.