QPad saves some user preferences. Saved preferences are stored locally on the device the app is installed on.
QPad does not store any data relating to the files that you open and edit. If you save a file, it will be saved where you choose and nowhere else. QPad may, however, temporarily store some or all of files that you open for the purpose of recovering the document if QPad hangs or crashes. If QPad crashes or hangs and data is not saved, QPad might try to recover it next time you open it. This data is only stored temporarily and is stored locally. If recovery data is stored, QPad will inform you of this next time you open it.