Dropbox works like a charm. Every picture you take can be backed to the cloud while keeping the original in your phone. You can chose to do this via WI-FI only or WI-FI+ phone connection. You can download any picture from your dropbox account any time as well.
I refer you to Reno55's post at the top of this thread, where he states this is exactly what he wants.
No or very few photos on the phone, but instant access to photos in the cloud.
Sent from my A700 using Tapatalk 2
Exactly and I said how I do so with syncing Picasa in accounts settings. Which does not physically put the photos on the phone but allows you to upload to picasa and view your Web albums through the gallery without a 3rd party app.
I have it set to sync picasa and have none of my 30k+ pictures physically on the phone, just viewable through the photo gallery