Yes, this is clear as per design of the glacier storage backend.
However, the problem ist not the restore action, the problem is that
when duplicity wants to restart a backup (because e.g. the upload failed
recently) it wants to download the latest archive to verify the use of
the same keys.

This is not possible with glacier and therefore if the upload of a
backup to glacier fails the backup can never be continued.

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https://bugs.launchpad.net/bugs/1875937

Title:
  Download of vol1 in validate_encryption_settings() fails when using S3
  glacier

Status in Duplicity:
  Triaged
Status in duplicity package in Ubuntu:
  New

Bug description:
  Duplicity version: 0.8.12.1612
  ubuntu 20.04 LTS
  python 3.8.2

  When i try to restart a backup which goes to S3 (via boto3) (use of:
  --s3-use-deep-archive or --s3-use-glacier) it fails:

  Last full backup date: Wed Apr 29 17:45:32 2020
  RESTART: Volumes 2 to 2 failed to upload before termination.
           Restarting backup at volume 2.
  Attempt 1 failed. ClientError: An error occurred (InvalidObjectState) when 
calling the GetObject operation: The operation is not valid for the object's 
storage class
  Attempt 2 failed. ClientError: An error occurred (InvalidObjectState) when 
calling the GetObject operation: The operation is not valid for the object's 
storage class

  This is because a file stored in glacier cannot be downloaded. I dont
  know if this known?

  To solve this: either skip validate_encryption_settings() when using
  any of this storage backends or introduce an option to skip the
  download manually (e.g. --skip-download-on-restart)

  I fixed it for me with manully skipping the
  validate_encryption_settings() function.

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