Interesting, though it seems a bit unstable: If not clicking the right things in the right order, then export.5apps.com crashes with errors in Chrome’s developer console. When I finally was able to see /documents/ and clicked on it, I got:
Possibly uncaught error: ["cannot fulfill maxAge requirement - remote is not connected"]
It would indeed very easy (literally like 20 lines of code, probably) to write an app that:
takes all your data and lets you download it as a zip file,
takes a zip file and lets you upload all the files from that.
I actually prefer an uncompressed daily (cron) backup of the JSON files to my home directory. Uncompressed data works better with the daily incremental backup of my home directory.
Looks like fun, but I’m not in Berlin these days.