Elai, fortunately our gear can handle any power source we'd ever encounter. Have a look at your laptop power supply next time you think of it -- 100-240V! Another benefit of increasing globalization.
Mailing hard drives would be nice, but it's one more thing to carry, it's a little cost prohibitive, and losing one in the mail would be bad news.
For now I'm going to be uploading footage to Amazon S3. It's relatively cheap, as fast as any other online storage server, and redundant. I'll post about this later. :)