I posted a HN question:
It’s one of the most often requested feature from Dropbox: a RPi client. See https://www.dropboxforum.com/hc/en-us/community/posts/202894235-Client-for-Raspberry-Pi for example.
It doesn’t seem to be technically challenging since they already have linux clients, and also clients that run on ARM architectures (see Android).
Why isn’t Dropbox releasing a Raspberry Pi client?
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I’ll have to study this: Going Serverless: Migrating an Express Application to Amazon API Gateway and AWS Lambda
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OK, I’m sold on AWS Lambda. This week’s project changed. Details soon! :-)