Avast popped up with it for me as well just when I plugged in my memory stick. When scanning the file from the backup, it also flags it, meaning it must be a false positive, since it has only started doing it.
Screenshot when I scanned the windows backup version:
http://i.imgur.com/4DNDwuV.jpg
Edit: It is also flagging trz61C4.tmp as well, Virustotal scan:
https://www.virustotal.com/en/file/b13ddbacad0d8410acc9d6c18d34db1a415ab85475d946aa54c26e430a96c485/analysis/1403469257/