Honestly, you don't. That's the whole fallacy of "the cloud". In my mind, it's really designed for text documents and spreadsheet and PDFs, not large graphics files. You are better off with several hard drives for image backup than trying to upload a nearly 1GB image to a server somewhere. My 2-cents.
One potential model:
1. Upload your raw image files to "the cloud" (large, but not 1GB each)
2. Carry out edits using your PC, mac, iPad, ...
3. Edits are parametric like Lightroom
4. Press "print", and a suitable rendering is transferred to some printing facility
5. Editing feedback is a downsampled version suitable for your lowres display
If you like, you can download a 5KB file containing your edits, that together with the raw file that you have locally anyways is "the image". Adobe might even let you render it locally, without network.
I see some benefits from such a model, and some drawbacks. If Adobe can have racks upon racks of tailor-made hw that does image processing much faster than any PC, where the hw cost is balanced against 1 million users (that each only need peak performance in short bursts), it may allow new fancy algorithms that cannot practically be done today without waiting forever, or buying an Nvidia rendering farm.