@A_G,
The information you’ve provided is fantastic. Thank you so much!
Have you attempted to enable AWS S3 Data Archiving with the values you are using in Application Globals rather than global variables only? If you have not, can I suggest attempting this test with just 1 device? This would allow the Archive Backfill to run a bit quicker, as it is less data than the 11 devices you have listed.
Thank you,
Heath