Got it to work. I have backups going to "Onedrive" so I downloaded them through there.
Just now I selected download but through the backup console in Plesk which is still downloading from one drive but for some reason PeaZip managed to open that properly.
Anyone able to figure this out? I need to recover a down site but the back in this format has been impossible for me to recover for some reason. I'm on macOS and I have all the .tar files but cannot decompress. I've installed Zstandard, I've used PeaZip and nothing seem to decompress the files...