After time you will notice your Aperture Library growing ridiculously big. Here a are few tips to shrink it back down and keep it optimal.
1. Keep master files out of the Aperture Library
I strongly encourage this as it makes your Aperture Library much easier to manage and keeps free space on your workstation for more important things. I work in a 250gb SSD drive and space is important. Keep your masters on an external drive or network attached storage and only import them locally while you’re working on them. Adobe Lightroom gets this and actually never puts your masters in the Aperture Library. Or as they call it, catalog.
2. Create a Aperture Library for different projects
This will keep your libraries small and efficient. This is especially nifty if you work on a laptop with limited space. Imagine going on a trip to take photos. You don’t need to carry your whole Aperture Library with you. You want as much space possible to take as many photos as you need. You can, if needed, merge your Aperture Library into another “master” Aperture Library to consolidate everything in the future.
3. Trash your thumbnails
Some might be stale anyways and it’s nice to get rid of excess. Aperture will regenerate what it needs when you access it. Pop open a terminal and run these commands:
find ~/Pictures -name "AP.Thumbnails" -delete find ~/Pictures -name "AP.Minis" -delete find ~/Pictures -name "AP.Tinies" -delete
That saved me about 10 gigabytes. Your mileage may very.
4. Rebuild your database
option + command on your keyboard while opening Aperture. This will bring
up the Photo Library First Aid dialog. Click Rebuild Database then Rebuild