Landlord, I want to share a little skill with you. First, you install a VMware virtual machine and then run a training camp in the virtual machine. Update the data after running (don't close the training camp), and then create a virtual machine snapshot, so that the training camp is running every time you open the virtual machine snapshot. (This method is best to store the training camp and data on the disk of the virtual machine. ) It's just that the data after each training can't be saved. This is one of the ways. Another is to run the training camp with a virtual machine. As long as the virtual machine system is turned on every time to run the training camp, and the virtual machine system is reinstalled after the number of times is used up, all the data of the training camp will be saved on the USB flash drive, so that the data of each exercise can be saved. These two methods are the simplest infinite trial method. If you don't know how to use the virtual machine, you can exchange information or look for materials to learn online. It is best to use VMware virtual machines. Other virtual machines don't seem to have snapshot function. If you use the virtual machine that comes with windows for win7, you can only use Method 2. I hope it helps you.