The Glacier Instant Retrieval storage class (GLACIER_IR) isn’t an option in the Cloud Sync Task for Amazon S3. It is an option in native Rclone config. Can I change this in the backend configuration?
Hi there fastTalker. This isn’t an answer to your question directly, but I wanted to share my solution. I have found that the Cloud Sync options in the GUI don’t offer the flexibility that I need. My solution instead was to install the native AWS CLI and use their sync tools instead with some simple bash scripts. You see, I have over 50 TB worth of data in each of my pools and when using the Cloud Sync options in the GUI, the rclone backend wanted to re-sync everything to AWS Glacier. I also needed the ability to add / remove objects from the Glacier Deep Archive storage tier. This works well for me.
Hi @fastTalker
I’ve created a Feature Request for this: Add Amazon Glacier Instant Retrieval class (GLACIER_IR) to S3 Cloud Sync options
If you or @nihil2040 find it valuable, go ahead and add a vote there for it. 
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