I have a valuable repo of documents that is a few hundred MB and grows slowly -- need to have a Plan B in case MegaCorp decides one day they don like my nose.
No, I don't think so. At some point you have to have some computer involved somewhere. If you have a valuable repo of documents that is just a few hundred MB and grows slowly I would recommend you look into something like tarsnap You already have your data locally. Assuming your repo is less than 1 GB in size and you don't change your data too often, I think your expense is only USD 0.50 a month. based on Storage: 250 picodollars / byte-month of encoded data ($0.25 / GB-month) Bandwidth: 250 picodollars / byte of encoded data ($0.25 / GB)
Prepay fifty dollars and it should last over eight years at fifty cents a month. I don't use tarsnap but if your documents are valuable, it might be worth the cost.
I can think of a few ways to do this as long as you are wiling to spin up a tiny instance somewhere, you could even do it in a /tmp directory if you dont want to save it there.