iPhoto Backup To External Drive

I am currently in the process of backing up all my photos so that I can move the main libraries off of my main drive on my laptop. I have already moved the "iPhoto Library" file to an external drive (Drive_1), re-routed iphoto to locate the library there, and then run time machine onto another drive (drive_2) that includes Drive_1. To give a more visual Layout:

1. iPhoto is located on Drive_1
2. iPhoto is backed up through time machine on Drive_2
3. iPhoto is still on my laptop drive as well

While I have iPhoto backed up at this point in the "library" format through time machine, I would like to make a seperate backup onto a third drive (Photo_Backup_Drive). However I do not want to have it in the "library" format. I would like to export all the files as ".jpg"s and ".mv4" etc and stored on Photo_Backup_Drive as straight files. Is there any way to do this where I can update my iPhoto library and automatically have the files moved on the "Photo_Backup_Drive" as plain files? Thanks for your suggestions.