They provide IMAP and POP to let you download your email.
IMAP also discards information - I don't just want my email, I want my tagged email.
Not.
If you want to keep the tags, take a look at heliotrope[1], a personal email server with tag support that can sync Gmail accounts.
I also live in an area where latency is normally measured in seconds, so I think you and everyone downvoting me are living in a slightly different Internet from me.
Heliotrope sounds like it might offer a good alternative without a six hour journey back to civilization.