My upgrade of CMS Made Simple was interrupted because I left the page... Didn't see that warning :(
I had "Make back-up" checked. And I think it was all interrupted while at "74% of Checking Retrieved Files" or something like that. Was it interrupted while making the backup? How could an interrupted upgrade harm my installation? Is it messing around with my php databases or just the files on the ftp? If the second is correct, probably it is a good idea to upload the exact copy of my old installation to the ftp?