I've been using AOMEI Backupper and PA for a couple of years, and loved them before now. Now, I hate them.
I downloaded Backupper 3 (free version) and ran the install. It first asked me if I wanted to delete the old Backupper, so I said yes, and it did that and stopped. So I started the install again, and it stopped in the middle of the install, saying it couldn't copy some dll. No big deal, I thought, I'll reboot and try again. But I couldn't reboot - boot error. I booted my Windows DVD and tried to repair it --- it couldn't repair it. I attached another drive and booted from that, and found that my old C drive was gone -- the other partitions on the same physical hard drive were still there, but the 100GB C drive was gone, and in its place was the 128MB Windows EFI partition or whatever, which had been hidden before.
Not a complete disaster, because I had a recent backup image, and I was about to install Windows 10 anyway. I installed Win10 on a new drive, and taking complete leave of my senses, I installed Backupper 3 on it. That went without incident. Then I made a backup of the new Win10 boot partition, to restore to where my old C drive was. The backup said it couldn't proceed because VSS wasn't started (it was, I checked before I started the backup), but it proceeded anyway, and reported success. There was just 14GB of data, since it was a new Win10 install, and I had deleted the Windows.old folder before I made the backup.
Then I restored the Win10 image I just made to my old C drive that had been trashed by the Backupper install earlier. It reported success, but suddenly a 1.5TB partition on the same drive was gone. Just gone. I looked in PA, and it said the space was unallocated. I had over a terabyte of very important programs and files on that drive. Looks like they are gone forever.
Stay away from this product. It will F you up.