[jergosh]

There are four copies of each part of the message so you can lose entire chunks and still be able to recover everything. As for subtitutions, unless you get the same error in 2 copies out of 4, there should be no problem.

The 739kb isn't a limit in any sense, the main limitation is that DNA synthesis is currently expensive.

[wonderingwhy]

related question, on putting messages into dynamic, living systems:

let's say the 'message' is so large it can only be inserted into a 'junk DNA' (non-conserved) region of the genome.

is it correct to assume there are less active/robust dna repair mechanisms to 'fix' the insertions, deletions, substitutions described above than in conserved regions?

what might some numbers be for errors rates in non conserved regions ( 2x, 10x,...) compared to conserved regions? or maybe one type of error is relatively much higher than another kind?

im guessing sources of insertion/deletion/substitution 'error' are mutations over lifetime of cell, and also replication errors in daughter cells.