I have an even better idea: manipulating growth rings of trees for message storage. If you want to store a 0, you cover the tree with a tarp for a year to stunt its growth. If you want to store a 1, you leave it uncovered. Bandwidth is 1bit/year.
1979 called, and they want their "Intel Magnetics 7110" one megabit bubble memory chips back. At the time, it seemed that bubble memory would supplant disk, tape, and even core memory (RAM to you). Maybe memristors will happen.
lol I have some bad news
If so, they’re very talented at it
[1] https://aws.amazon.com/s3/storage-classes/glacier