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I want to backup files with a specific extension to a NAS.

I know some of the cloud based applications like Mozy can do that.

How can I achieve that without a cloud-based tool?

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up vote 1 down vote accepted

FreeFileSync is a great backup free & open source software.

It can use filters (include and/or exclude) with wildcards such as *.pdf.

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From seeing the screenshot on this site, I would assume that BackupPC can do what you want.

I've previously recommended it here: Take automatic backups of all computers on network

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