mystery of missing file modifications (hybrid drive + Ubuntu 12.04)

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http://askubuntu.com – Last week (Sep 10) I worked a whole day (on my Ubuntu 12.04 HP elitebook 8530p laptop) using a tex editor (TexWorks) and Jabref to maintain a Bibtex library. Today however I noticed all my modifications of that day are lost! The 'Date Modified' date on the files indicate the last changes two weeks ago (Sep 4). My first reaction was to look at the editors for not properly saving due to either program bugs or file permission problems but after finding no problems and when I launched my online backup program CrashPlan (which saves file modifications every 15 minutes) my latest modified files had (HowTos)