Partitionning iMac internal HD in order to use MBA as main computer?

I'm planning to use my late 2011 MBA (with the lid down) plugged to the Thunderbolt equipped iMac I'm buying now.
The MBA would therefore become my main machine (I'm actually replacing my actual iMac which is not Thunderbolt equipped. The new Thunderbolt equipped iMac will be used only for tasks I can't perform with the MBA and as a replacement machine in case my MBA goes to repair, right).
I would like to store all my data (pictures, films, websites projects, documents, iTunes & Aperture libraries, and so forth) on the new iMac's internal HD, the advantage being I could access the mentioned data at Thunderbolt speed without having to purchase an external Thunderbolt HD.
I'm thinking of creating 2 partitions on the iMac internal HD:
- one partition for the iMac
- a second partition the as my data repository I would access mainly from the MBA - and also from the iMac when needed.
Hence my questions:
- is it a good idea? if not, what could be the problem?
- if somebody has a better solution, please let me know.

If your backup external drive has a power brick the Thunderbolt<->FW adaptor will work, many bus powered drives require more power than Thunderbolt provides. However you may be fine with USB. Your first TimeMachine backup will take a while, subsequent backups are shorter because they are incremental. I tend to connect my MBA to its external USB TM drive once or twice a day at home and the backup takes just a few minutes unless I install a big OS or program update. I strongly recommend against connecting the drive to your base station - for whatever reason at some point - days, weeks or months later - the backup session will fail and after that nothing will get it going again except formatting the drive and starting over. Apple doesn't support this form of wireless backup.
Take a good look at your current drive use and try to think back to estimate how your drive has expanded over the last couple years. Adding a larger drive to the MBA later is expensive and carrying around an external drive isn't particularly fun. Will 256GB be sufficient 2 years from now? Remember, you need to keep 10-15GB free for temporary files.
Finally, remember that a computer you carry around is at greater risk than the one sitting on your desk. A single backup drive is better than most have but two is better. A third kept somewhere other than the home is best. I like having one of those backups being a clone because I can boot up with it and get right back to work.

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