Name gzipped TAR backups .tar.gz instead of .tar

When a database backup uses TAR compression, the file is uploaded as <name>.tar, but it is actually a gzip-compressed tar archive (a .tar.gz).

What happens:

file backup.tar reports "gzip compressed data"
tar -xf backup.tar fails in tools that don't auto-detect compression; you need tar -xzf
S3 storage (Cloudflare R2 in my case) stores it as application/x-tar instead of application/gzip, because the content type comes from the extension

Request: Use .tar.gz (or .tgz) as the extension for compressed TAR backups, so the name matches the content and restores work as expected.

Thanks!