HP Upline sucks. The UI looks pretty but you must select files by extension and you cannot tell which extension you forgot about. Support is just people reading from a script:
We would like to inform you that there is no way of identifying a missed file type. Our kind recommendation for you is to prepare a list of every file name extension and then, you need to add them one at a time. Please make a note of all the software installed on your computer. From this list of software installed, you need to arrange a separate list of file types related to each software application installed on your PC. This will help you to locate the missed file type.
I am now trying Mozy.