I'm not sure how. If it makes a copy then its not destroying anything, as long as I have the original to fall back on I don't care.
The term "destructive" is referring to information being destroyed, not the image. With Aperture's current adjustment strategy, we have all of the original pixels and all of the information about all of the modifications you've made to it. Then that information is processed and displayed as an output image, but the system retains all of the information used to create that output. As described above, this is useful because you can manipulate this information independently to adjust the output image.
With the plug-in scheme, the information from the adjustment steps and the original pixel data is being destroyed before passing to the plug-in. You can revert to a backup taken before the plug-in, but that really is just a backup.
Why do you need Noise Ninja or a dodge and burn tool for something you yourself said, "People are not buying Aperture to replace Photoshop...they are buying it to manage their photo workflow which Photoshop is not designed to do."
My fear is that Aperture becomes a schizophrenic program - it can't decide if it's a photo mamanger or photo editor.
So far, I think Aperture has done a good job of walking that line. I saw this announcement and started to worry about the schizophrenia you're worried about too, but if it's relegated to plug-ins then I can just choose not to install them and Apple can focus on the management part.
I have to say that I really appreciate the adjustment capabilities in Aperture2. I can very quickly and easily improve a picture. I'm not much of a Photoshop jockey myself, so I'm happy to avoid the complexity where I can. Most of the Aperture adjustments are full image adjustments-- there's no selection capability. The exception is red-eye and spot/patch. I spent last weekend restoring a bunch of images I scanned from negative and I'm glad the spot/patch was there.
Noise Ninja strikes me as a full image adjustment. I wouldn't mind something better than the current noise reduction in Aperture.
I don't think I want a paint brush in Aperture though...
I haven't tried it yet (still getting my new system set up), but according to this Time Machine only does an incremental update.
http://www.apertureprofessional.com/showthread.php?t=12015
"..."
Perhaps Time Machine backups that were first created before the 10.5.2 update work differently that this new backup the person created???
It is incremental, but in kind of a brain dead way... While Aperture is open, Time Machine drops the library from the backup list. Any backups created while the application is open don't contain the library, and the whole library is flagged as "dirty". Then, when you close the application, TM has to scan the entire library looking for changes.
Disk space numbers seem to indicate that an incremental amount of data is being written to the TM disk, but it still takes a long time for TM to scan that whole library so disk access remains slow for a couple hours after I quit Aperture.
The other thing that worries me is that I think the free space on my TM drive goes up while Aperture is open-- I think at least the most recent backup of the library, if not all backups of it, are taken off the TM disk.