Storage
What Fixamgo still has of yours, when it goes, and a button that makes it go now.
Fixamgo does not record who uploaded what, so the server cannot be asked what is yours. This list is kept by this browser, of the documents it opened. Work done in another browser, or before you cleared this site's data, will not appear here, and is deleted on the same timer regardless.
On the server
Pages you are part-way through scanning are not in this list: they are held as loose images with nothing tying them to this browser. They are deleted on the same timer.
In this browser
Clearing this does not delete anything on the server: those files go on their own timer. It does mean this page can no longer list them, and that your profile, if you have one, becomes unreachable from this browser.
Keeping your own copy
The file holds your unfinished work, your settings and your profile link. Nothing is uploaded to make it: it is built here, from what is already on this computer. Backing up to your own Google Drive runs in the Fixamgo app, where the phone can ask Google for permission to its own folder and nothing else.