As far as I know, these casual cloud storages of Dropbox type don't fit well for the purposes of storing backup there - it's too much complicated for them. The information provided by the PDF file above is absolutely correct yet the link seems malfunctioning, it opens the document as a one single blank page. I tried to upload it there https://ds11.pdffiller.com then save and open as a new file and it worked out, but it would be better if they got the source updated. Or if you have Foxit Phantom or something related, just open the file with it
back up to a local attached drive
then verify its contents
THEN upload it to dropbox (whole backup folder) if you want (with verification while uploading, ifyou have a program that can do that)
I believe it would be more reliable that way, and faster - the backup can get done fast to a local drive,then yo can have upload happen at a slower pace in background