How to Change Lightroom Backup Location

To change backup locations, Open Lightroom and select Catalog Settings from the Lightroom drop down menu
select catalog settings from the lightroom drop down menu

Select “Everytime Lightroom starts” from the backup section.
select every time lightroom starts from the backup selection

Now restart Lightroom.
quit or restart lightroom

When the backup catalog opens you can then change lightroom backup location.
once re-opened, change lightroom backup location