Object-level data is stored only 33 days. However, historic summary-level response time and availability metrics can be seen through Trending for up to 12 months for Backbone, Last Mile and Private Peer.
If you can only see 33 days worth of data in Trending, this typically indicates you are using an Evaluation account. If you believe this is an error, please contact your Account Manager. They will work to ensure that your contracts are in order, and your account is configured correctly.