Consider moving to an ECS/container-based script c.f. google-drive-backup

[floehopper]

From this Trello card:

As mentioned in [this comment](https://trello.com/c/ta2tyW6l/11141-alarm-trellobackupstack backupboarddeadletteralarm0e94c2cd-aele9dp53ol5-in-eu-london#comment 5f3a4fcf0980868dcf61e26c), my suspicion is that the HTTP request for all the JSON for the "Go Free Range" board is taking a very long time to respond (or even timing out) and that this is likely to happen more and more often. This might mean we need change the backup to be more incremental or at least be a combination of a series of requests for parts of the data, rather than requesting it all at once.

I think the best way to do this might be to move to an ECS/container-based script like the Google Drive backup and the Heroku database backup and use a tool like this: https://github.com/jtpio/trello-full-backup.