Group: Forum Members
First, you should edit your post above to remove the last line you pasted, since you just posted your Reflect license key to a publicly viewable forum.
In terms of your issue, it sounds like Reflect isn't finding a Full backup at the destination that it can append to. Did you recently upgrade to Windows 10 1809, perhaps? If so, it might have created a new partition on your hard drive, in which case the partitions selected for backup on your system may have changed, which can obviously have some nasty consequences if you're no longer backing up the data you think you are. I would edit your definition file to make sure that you're still backing up the partitions you mean to be. If so, you may still need to create a new Full backup due to some partition configuration changes that can happen as part of a Windows upgrade. From that point on, you should be able to create Incrementals.
If you're not using a definition file, which it sounds like you might not be based on you saying you clicked "Create Incremental" -- under the Restore tab? -- then you might want to think about creating one. It's an easy way to save the desired settings, and then at any given time you can right-click the definition file under the Backup Definition Files tab, select Run Now, and choose the desired type of backup, including a Full. Under your method, when you want a Full you have to step through the entire wizard again, which is tedious and error-prone especially if you want to make customizations to the Advanced Options. To make a definition file, just step through the wizard and keep the "Create an XML file" option checked in the dialog that appears after you click Finish. Then you can access it under the aforementioned Backup Definition Files tab.