By default data store on Veeam One SQL database will keep for 12 months. If you would like to change the retention period, you can do so by following the below step.
1. Go to C:\Program Files\Common Files\Veeam\Veeam ONE Settings
2. Double click VeeamOneSettings
3. Click on Retention tab
4. Enter your prefer value , click Apply Retention & save.
Hope this help
