CB Listed Modified Date Does Not Match Directory You can't move the files. There is no such thing as a move in Glacier anyway. The best way to correct this is to switch to advanced mode and back up the files again to Glacier.
I'm not sure what you're referring to with network costs related to moving storage providers. But I'll reiterate that backing up to Glacier is not ideal. We do support it with the stand-alone products, but do not support it with our MSP-focused products. If cheap is what you are after, I think you'll have a much better experience using something like Wasabi or Backblaze B2. But as I stated above, if you want to keep Glacier, create a new backup plan and switch the type to advanced and back up the files again. Once that is complete and you are sure you will not need the files you currently have backed up, you can delete the old files from the Storage tab in the client.