Aperture doubles my space used...what to do?

Hi,
I am using Aperture Version 3.6 on OS X Yosemite 10.10. I just realised that my 28'000 Photos use a disk space of 680 GB.
I found out that i have:
300 GB of Masters
260 GB of Preview
110 GB of iPod Photo Cache and
15 GB of Thumbnails!
I did some research and found out why Aperture makes Previews and why there is an iPod Photo cache and what Thumbnails are. So that is clear to me.
I now have the following questions:
1) Does iPhoto also create previews, iPod Photo Caches and Thumbnails?
2) If I switch to iPhoto can i save disk space? If yes how much and why?
3) (Only if answer 2) is yes) how can I stop using Aperture and start using iPhoto without loosing the master files.... It would not be that bad if I loose the changes I made to some of the photos. And also how can i switch without having any space to temporarily have both librarys next to each other ...(i just do not have 1200GB of space on my macbook;P)
I appreciate your help,
regards jl

iPhoto and Aperture are using the same library format. You cannot save space by switching to iPhoto. Other than Aperture will iPhoto always render previews and always render Faces and use even more disk space than Aperture.
In Aperture you can disable the creation of previews and faces, and delete the previews that already have been created. (Photos > Delete Previews). The creation of new previews can be disabled in the "Preferences > Preview" settings.
If you are running out of space, consider to relocate the original files to an external drive.
See this manual page:  Aperture 3 User Manual: Working with Referenced Images
BTW: You can delete the iPod Photo Cache from the Aperture library without doing any harm. Only, it will be recreated overtime you sync your photos to a mobile device.

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