Hello, the chat records storage life are as follows：

[The local cache]：There's no time limit for DingTalk local cached chat record, it will be in DingTalk app all the time except you delete the client (mobile & PC).
[Cloud Backup]：DingTalk chat record support cloud backup. Use one account login any devices (includes uninstall and reinstall, or change cellphone, the chat record will automatically synchronize to the cloud backup, and the historical chat record can be check by slid chat screen within 360 days.
[Records life time]：In order to ensure the customer's information security and the experience, the cloud backup adopted international authentication security algorithm to encrypt saved, at the same time the chat records are valid for 360 days long, over the period of validity of the message will be automatically cleared.
（Because of the cloud backup of chat consumes quite a few storages. 54/5000 With the industry baseline value of 180 days and the feature of the work and business conversation, DingTalk offers a 360 day long set of expiration dates.
At the same time, in order to meet the needs of different enterprises, we are actively trying to offer a customized solution for the period of validity, and please pay your patience and attention to the updating of our products.）