Depends on the filesystem type you use for your Linux partitions (like ext3 which is commonly used these days). First you get a driver of some kind (I know there is a driver that lets you mount linux ext partitions on Windows), to get the partitions visible. Then just use some backup program or tool to back the data up; if you can't figure anything else out, just copy the data in binary mode, bit by bit.
I'd still suggest using a Linux or Unix of some kind for this; that way you could easily use some tools like cpio or dd, depending on how you want to make the backup, which would provide you a very easy and efficient way of backing data up. Windows just can't do the job as easily, imo.
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