Hello Again Twerppoet
Thanks yet again for your timely and informative reply. I think I'm finally beginning to understand how iOS works.
No problem. I think you've almost got it. I'll add some clarification below.
I'm actually not able to try out any of these suggestions for myself either. I'm currently in India. I bought my iPad online after Christmas so it's waiting for me back home in the UK. I haven't purchased a WIFI storage device yet - so hopefully I can research the bundled app thoroughly before I do.
That's good. I'd hate for you to be stuck with a device that you couldn't use for what you intended.
OK. So I'm going to try and explain my understanding of how this works. Please correct me if I'm off the mark. In iOS, documets are tied to applications. When you use "Open in" from one app, it just creates another copy of the file within the destination app. So unlike in Windows, instead of having one file that you can open in several applications, under iOS every time you open a file in a new app, it creates a new version of that file within the new app.
This was completely true in iOS 7 and earlier. In iOS 8 we now have iCloud Drive. Besides allowing the syncing of files between devices and computers, iCloud Drive allows apps to access files that are in other apps. However, it's not universal. Not all apps support it, and one of those, unfortunately, is GarageBand. I suspect Apple will add this support eventually, some apps are always trailing behind, but even when they do it probably won't support project files, just the importing and exporting of audio tracks and loops.
So...to back up my Garageband projects, iFiles has to be able to browse to the .band files (which are actually folders right?) and support the "Open in" feature, which will bring up a list of apps. The app that comes with my WIFI drive has to appear in that list, or to put it another way, it has to appear on the "share sheet" - is that right? If I can nail this terminology I can begin asking the right questions. Similarly, in order to restore my projects, the app for my WIFI drive also has to support the "Open in" feature, so I can open it in iFiles and from there restore it to the appropriate Garagaband directory? Please me know if I've understood this correctly. And just to clarify this share sheet terminology...when we say an app supports Share Sheets, does that mean it has the "Open In" function, or that it appears in the list when the "Open In" function is used? Hope all that makes sense.
This is pretty close. Almost all of Apple's file types are actually folders, but most apps made for OS X and iOS are smart enough to treat the bundle as a single file. However, GarageBand is only too likely to be an exception. Unlike the iWorks apps .band files are rarely moved around and shared online. That means third party tools are unlikely to recognize the extension. Even Apple's apps may not recognize it outside of GarageBand.
Open In and Share Sheets are pretty much the same thing. The first is the old way of doing and referring to the ability to send/copy a file to another app. In iOS 7 and even more so in iOS 8 Apple change the look and feel of the feature. iOS 8 included several other kinds of actions in the dialog, and revealed that Share Sheets were actually just a subset of Actions which are all based on Extensions.
Here is a post I made about Extensions when they first came out. I didn't nail the terminology, but it should be close enough to give you and idea of how things are supposed to work now. But hold in mind were are still in transition. Not ever app supports these features properly. Good news, Share Sheets/Options/Icons aren't one of the issues, since they've pretty much been supported since iOS 7.
http://www.ipadforums.net/threads/about-extensions-the-basics.123969/
Thanks for exploring the Garageband share options for me. Is iFiles likely to appear as an additional share option from within Garageband once it's installed? Or do I have to browse to the .band files from iFiles as mentioned previously. Once again, I hope that makes sense.
This is what worries me most, that iFiles won't know to treat .band extensions as files. No way to know until someone tries.
I'm almost certain you will not be able to restore/copy .band files from your wi-fi drive directly back to GarageBand. There is no mechanism for this. The only import option is for audio files/loops. To recover a saved .band project you'll probably have to use a computer and iTunes. Since you're contemplating this mostly as a backup, it shouldn't be a major issue; unless you lose and need to recover a file before you return home to your computer.
You might be able to use iFile to insert the .band file back into GarageBand's folders directly. However, this is pretty risky. You never know what other support files or indexing you might be bypassing. You'd want to experiment with this carefully, before you put a ton of un-backedup files into GarageBand.
In genreal it is fairly safe to copy files using iFiles. It's always risky to delete or add files. iOS wasn't designed for users to interact directly with the file system, which means apps might not handle unexpected changes gracefully.