From the Import/Export page, click on the Items stock under the Exports column.
On the window that appears, select which Warehouses you want to export item stock from and then click the Export button.
After a few moments, an Items button will appear, allowing you to download the exported Items stock CSV file.
Make copies of this file and keep them somewhere safe in case you ever need to restore your data at any point in the future.
TIP: You can also Automate stock exports for historical record of inventory snapshots