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Backups: Misleading 502 proxy error

Environment:

  • Software: FreedomBox v0.45.0 testing downloaded on Jan 2, 2019
  • Hardware: Raspberry Pi 2

Testing the backups feature is the only blocker to discontinuing support for the Dreamplug and Raspberry Pi 1. In order to test the backups feature, I installed every app and feature on the then-latest testing image. After successfully installing every app and feature available in v0.45.0 (Note: SIP/Repro was the only app that was not available), I attempted to create a backup and got this 502 proxy error:

backups

Refreshing the page yields the same error.

But when I go to plinth/sys/backups/, I can see 3 existing backups, presumably each corresponding to the first attempted backup and the subsequent two refreshes of the plinth/sys/backups/create page.

backups2

I can confirm that the backup archive downloaded successfully.