All files saved to external HD in last 2 days are gone or corrupt.

The last couple days I've had specifically two whole folders and all files inside either go corrupt or missing on my external hard drive. At first I thought my external was just failing so I recreated one of the projects and saved to another external hard drive. Woke up this morning and that folder is completely missing along with the 2-3 files inside. Now, I'm scared it's a Mac issue not a hard drive failure.
I save all my files to an external hard drive which then gets backed up via CrashPlan to their online backup. Unfortunately CrashPlan is slow to upload files so the most recent ones are not backed up.
I'm running 10.8.5, haven't updated to Mav yet. Is that advisable?
Help help help.
Thank you!

Back up all data immediately as your boot drive may be failing.
This diagnostic procedure will query the log for messages that may indicate a system issue. It changes nothing, and therefore will not, in itself, solve your problem.
If you have more than one user account, these instructions must be carried out as an administrator. I've tested them only with the Safari web browser. If you use another browser, they may not work as described.
Triple-click anywhere in the line below on this page to select it:
syslog -k Sender kernel -k Message CReq 'GPU |hfs: Ru|I/O e|find tok|n Cause: -|NVDA\(|timed? ?o' | tail | open -ef
Copy the selected text to the Clipboard by pressing the key combination command-C.
Launch the Terminal application in any of the following ways:
☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)
☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.
☞ Open LaunchPad. Click Utilities, then Terminal in the icon grid.
Paste into the Terminal window (command-V).
The command may take a noticeable amount of time to run. Wait for a new line ending in a dollar sign (“$”) to appear.
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Magnus,
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Message was edited by: Seho Park
Message was edited by: Seho Park

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