Writing is extremely low-bandwidth. If I recall correctly, Shannon did some experimentation and found that per letter, English was no more than a bit and I've seen other estimates that it's less than a bit, per letter. (In comparison, depending on language and encoding, a character can take up to 32 bits to store uncompressed. Even ASCII requires 8 bits/1 byte per character.) And given the difficulty of producing a megabyte of personal information, and the vast space of potential selves...

If we're going to try to preserve ourselves through recorded information, wouldn't it make much more sense to instead spend a few hundred/thousand dollars on lifelogging? If you really do record your waking hours, then preservation of your writings is automatically included - as well as all the other stuff. Plus, this solves the issue of mundane experiences.