WinRAR: Restoring accidentally synchronized files?

When trying to add 4 files to an important winRAR archive, someone in my office accidentally clicked "synchronize archive contents". Now, only the 4 files are there and the other 12gb's of data are gone. Is there any possible way to restore the lost data in the archive?
Rajesh KumarAsked:
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Unless the file also existed in another location, say like on a server that is backed up, a flash drive, an external hard drive or something else, no. You *might* be able to get it back by doing a System Restore. However, unless you make sure to save all the work that has been done since then, you run the risk of turning the situation 180 degrees, and having the old data, but none of the new stuff.

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