Perhaps you could go on amazon and do a search such as "Wireless Portable Hard Drive iPhone" or something similar. There you'll see certain hard drive options (some up to 2tb) that create their own wifi signal which you can transfer stuff to and from your iPhone, or other devices, with.
The thing with those Wi-Fi devices is that I'm afraid they might fail. I think a Lightning-connected approach would be safer, specially when it comes to shooting videos that could be not recorded and lost forever.
I like it and it seems to be the most affordable choice from all the ones mentioned above. However, I'm under the impression that you can't record and save a video directly in that external device, and instead it works as a sort of flashdrive to transfer files that already exist on the phone to a computer. Am I wrong?
it depends on how you want to connect to it: wirelessly, or with cable?
Portability? Mobility : can I access from anywhere
The WD clouds are a good option if they fall in your price range.
I'd say cable is a better option, for the aforementioned reasons.
And what do you mean by portability or mobility? I think any of these devices would allow you to transfer your files from the iPhone to a MacBook on the road...
I really like the Airstash product. You can connect wirelessly to it via iPhone, iPad or Android device with its own wifi. Then it has SD cards that you can use interchangeably. Then you can also USB into a computer. I have been using it for the last year for everything at work with my PC and then also have access to anything on it via my iPhone. It's very portable as well.
Sorry, what device is that specifically?
Two that come to mind are Leef products (
http://www.leefco.com/ibridge) and the Mophie Space Pack/Spacestation (
http://www.mophie.com/shop/space).
You can buy external hard drives that have wi-fi built in, but the process to get connected and transfer I find has always been very clunky, prone to error, and slow. This is based on my experience with the WD My Passport Wireless. (
http://www.wdc.com/en/products/products.aspx?id=1330)
The Mophie one seems expensive, and remember that what I'm looking for here is a device as affordable as possible.
The Leef product seems exactly like what I need, though I'm a little but suspicious about the fact that you have to use their proprietary app in order to record a video and save it directly to the device. Have you tried it?
Regarding your comment on the wireless alternatives, I fully concur. I wouldn't want to run any risks of a lost connection when recording a video!