What is the backup retention policy?

The retention period for backups is determined by your project plan. 

By default, Upsun provides 1 automated backup a day for your production environment, with a 2-day retention (2 days worth of backups are retained at any given point).

For more information on this feature, please see the following page in the Upsun documentation:

https://docs.upsun.com/environments/backup.html#backup-policy