I don't know but let's calculate something. Firstly let's use 70 years as our time frame in which we collect data. Human is basically a bunch of sensors wired together so we can break down data collection to: visual, physical, chemical and acoustical. Starting with eyes which are roughly equivalent to 10 mega pixel cameras each, providing 3D stereo vision. Let's assume that frame rate of eye is ~60 fps and color depth is 24bit. Size of one frame is thus:
10e6 * 3B = 30e6B = 30MB/frame
Multiply that by 2 for stereo vision: 60MB/frame. Let's also apply compression to reduce storage usage. Practical limits shows that we can compress data up to 1:2 ratio so we have 30MB/frame for both eyes if we use lossless compression. In 70 years that amounts to:
30e6B * 60 s^-1 * 31556926 (seconds in year) * 70 Years = 3.9762e+18 = 3.98 EB
So if we assume all memories means documenting every single frame human eye sees numbers don't add up. I don't know if forgetting is accounted for in his theory but it said "all memories". Anyways continuing with audio perception let's model ears as stereo microphones recording at lossless 24-bit audio at 40kHz, each second takes 120KB of storage (also using 1:2 compression):
120e3B/s * 31556926 * 70 = 2.6508e+14B = 0.265 PB
That covers sound, moving on on chemical perception - smell, we need to distinguish between 1 trillion 10^12 different chemical compounds roughly 5B of information, along with intensity which we will assume is 8 bit = 1B. For simplicity we will use 1Hz as smell sampling rate, which I think is plenty fast (when someone farts there is some delay between sound and shit particles hitting your smelling receptors):
6B/s * 31556926 * 70 = 13.25 GB
Which basically amounts to fuck all when compared to visual data. Same holds true for temperature, pressure and touch sensors (there is also some bullshit humans make up from nothing, but we will neglect that). Main source of data is visual information, perhaps some more compression could be applied as humans don't have photographic memory, which means all previous calculations are bullshit.