This extension allows you to set backorder limit for individual products or you can set a global limit as well.
1. Disable your Cache and log out from Admin panel if you are logged in.
2. Unpack the contents of the zip file and upload the folders to your website root.
3. Log into Admin Panel.
4. Refresh or enable your cache if necessary.
5. Update any product on which you want to put a limit on backorder quantity.
Note: Backorder limit will be applied only when the backorder limit value is present.
Settings: System > Configuration > Backorder QTY Limiter.
► Select if you want global backorder limit or want to set per product.
► Set value for global backorder quantity.
► Set value of backorder quantity for any product.
► Enable/Disable the backorder limit from extension’s settings page under System > Configuration > Backorder QTY Limiter.