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While trying to save copies of files for backup, I tried using 'File History' in 'Control Panel>>Security'.

I noticed that some of the files did not backup and are missing. On looking into it, it seems to happening with files with a longer file name but these are not more than the permissible 260 chars.

Is this a bug? How do I take backup?

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Does Event Viewer have anything to say? What type of drive/filesystem are you using for File History? – Karan Nov 6 '12 at 23:15
Can you give some examples of the names of excluded files? – Matthew Pirocchi Nov 6 '12 at 23:19
No error message. I am using and external NTFS HD. – Kang Nov 6 '12 at 23:19
@Matthew Simple filename with numerals and alphabets. Maximum filename is 238 in length. – Kang Nov 6 '12 at 23:24
@Kang: Thanks for your update. Consider adding it as an answer to this question, and accepting it (so it will be more visible to future visitors). – Matthew Pirocchi Nov 6 '12 at 23:27
up vote 6 down vote accepted

File History is adding 25 characters to the file name for date and time of the version, thus the total length is exceeding permits.

This seems to be a bug.

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Or as MS would say, it's "by design". Review: "It should be noted that File History is an incredibly naive tool. All it does is check the NTFS Change Journal (a file system-managed list of recently modified files), and then copy changed files to another drive. For versioning, all it does is insert a timestamp into the filename. ... You wouldn’t expect this kind of behavior from a dedicated backup tool, so I’m not quite sure why Microsoft has chosen such a rudimentary implementation for a built-in operating system tool." – Karan Nov 7 '12 at 0:20

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