What Windows backup software can I use to do a block backup?

I have some VERY large files that I change on a daily basis, but what I change is very small, so I don't need to backup the whole file.  Is there any software that can detect what portion or block of files have changed and only back those up during an incremental backup and put everything back on a restore like it originally was?
cashonlyAsked:
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marsiliesCommented:
Where do you want to backup the files to?

For online backup, JungleDisk offers block-level bacup:
https://www.jungledisk.com/personal/simply_backup/features/

In fact, most online backup solutions should use block-level backup.

For backing up to a server, Windows Home Server used cluster-level backup for its full PC backups:
http://en.wikipedia.org/wiki/Windows_Home_Server#Computer_Backup_and_Restore

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dbruntonCommented:
You seem to be wanting an incremental block backup system.

Here seems to be one http://www.ca.com/files/FactSheets/ca-arcserve-d2d-facts_232459.pdf but there may be others.
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cashonlyAuthor Commented:
That might do it, but I was hopping to keep it under $100 for the software.
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