Time Machine Monitor

This installs Time Machine Monitor and a small background helper that lets it read Time Machine's per-backup sizes.

It will place:

• Time Machine Monitor in /Applications
• A helper in /usr/local/libexec and a background service that keeps its data current

After installing, you'll grant Full Disk Access twice — once to the app and once to its helper. The final screen explains how; the app also guides you. Nothing here modifies your backups.