If when closing CMS and backing up the file, an error message comes up that
says "invalid use of null. #94" or you get another error, this means that the program cannot backup your file to the designated location. Please go to Program Setup > Options > File Locations and towards the bottom change the backup location to a folder of your choice on your hard drive.
Important for multi-computer networks
The backup location you select must exist on all the computers on the network. The location cannot be in 'my documents' since the user names are different on each computer. We suggest using C:\Chabad Management System/Backups. This will allow each computer to backup the data file to their own Drive C, ensuring that you have backups spread out on multiple computers.