I had been using the free version of MSP360/Cloudberry to back up to the old Amazon Glacier. Recently I started using it to backup to the somewhat newer S3 Glacier Deep Archive, with the intention of re-doing my backup scheme.
The other thing I wanted to do is to switch from using the program on a Windows desktop to doing it on a Linux virtual machine on a headless Proxmox server (with a desktop environment accessed by RDP).