What is the Sandbox Storage Limits:
- Full copy sandboxes have the same storage limit as your production organization.
- Configuration-only sandboxes have a 500 MB storage limit.
- Developer sandboxes have a 10 MB storage limit.
- Sandboxes don’t send email notifications when storage limits are reached. However, if you reach the storage limit of your sandbox, you cannot save new data in your sandbox. To check your storage limits, click Your Name | Setup | Data Management | Storage Usage in your sandbox.