When you perform a Structure Backup, you have the option to include your Gantt charts and data in that backup. To include Gantt data, select the Backup Structure.Gantt option.
When you include Structure.Gantt in a backup, the following information is saved:
Values and dependencies stored in the Gantt charts
Resource leveling delays
Sandboxes, including sandbox history
Learn more: Backing Up Structure
Restoring Gantt Charts
When you restore Structure data from a backup, any saved Gantt charts and data will also be restored.
Learn more: Restoring Structure from Backup
Migrating Structure Data
When migrating Structure data from one on-prem instance to another, in order to include Gantt data, you need to select the Restore Structure.Gantt app data option.
Sandbox history is not restored with a migration.
Learn more: Migrating Structures