Check out the Vicon Revue. I'm into Lifelogging for years, I just don't record continuously yet. Note that I do not own the Vicon Revue but it is the only product I'm aware of that can do the job right now (in terms of size etc.), although without audio/video functionality. I'm simply using a compact camera and my iPhone so far. I even have a stationary camera in my room that takes a photo every minute. Last year I reached over a million files. Right now I got over 2TB worth of personal videos/photos/screenshots/logs etc., not sure how many files there are now though.
I often fantasize that lifelogging might be a cheap alternative to Cryonics, in terms of beta level simulations as described in some of Alastair Reynolds’ novels:
A poor cousin to an alpha-Level simulation, a beta-level is based on modelling the behavioural patterns of the person copied, attempting to predict their reactions to a given stimulus.
If you got my DNA so that you can clone me it might even be possible to imprint memories and behavioural patterns based on the lifelogs. I suppose that even without a DNA sample, given sufficiently powerful AI, such a beta-level simulation might be sufficiently close so that only a powerful posthuman being could notice any difference compared to the original. At least that's a nice idea :-)
Resurrection without a backup. As with ecosystem reconstruction, such "resurrections" are in fact clever simulations. If the available information is sufficiently detailed, the individual and even close friends and associations are unable to tell the difference. However, transapient informants say that any being of the same toposophic level as the "resurrector" can see marks that the new being is not at all like the old one. "Resurrections" of historical figures, or of persons who lived at the fringes of Terragen civilization and were not well recorded, are of very uneven quality. [Orion's Arm - Encyclopedia Galactica - Limits of Transapient Power]
A link on the subject (there were others, but they are behind a pay-wall now and I'm too lazy to look for a backup):
Nitpick: I'm not sure if that definition of a beta-level is canonically accurate; all I remember from Revelation Space is that that's how one specific beta was constructed. Also, there are unspecified technical reasons for believing that betas are nonsentient. I've been using the word "reconstruction" myself.
The old idea of lifelogging seems to be a reality now. It has the potential to be quite useful, and not just in distant contrived scenarios like cryonics or being recreated by an AI.
One of the classic objections was that we couldn’t afford to store the many gigabytes - possibly hundreds of gigabytes a year! - such a practice would generate, but right now you can buy 1 terabyte for <$50. And there’s no end in sight to whatever Moore’s law has been governing hard-drives over the past decade or two.
But how is one to record it? That seems to be the rub. All the storage space we could want, all sorts of new formats like WebM or Dirac or x264 to store the videos in - but what camera generates the data in the first place?
We don’t care about sleep time, so we don’t need any more than 16 hours or so of recording a day. We can probably get away with 12. Even 8 might be enough (to record yourself on the job - or off). An encoded compressed video might be 1 megabyte a minute or 60 megabytes an hour, but let’s be generous and assume 15x worse than that, or about 1 gigabyte an hour. So perhaps 16 gigabytes.
16 gigabytes of Flash costs $40 or less. So that’s not an issue either.
And presumably optics and microprocessors are very cheap given the incredible popularity of web cameras, digital cameras, digital camcorders and whatnot over the last decade.
But for all that, I can’t seem to find a mini-camcorder which will record even 8 hours and be a useful lifelogger!
Am I wrong? Are there existing products? It seems to me that it ought to be perfectly possible to take something like the uCorder, slap in $110 of batteries, and get it up to 8 or 12 hours’ life. But I have yet to find such a thing.