What it does
Restricts shaking to times when at least one connected USB device matches your comma-separated name list.
How it works
Shake It On enumerates IOUSBHostDevice services via IOKit and reads each device's product name. Your terms are matched case-insensitively as substrings.
Where to find it
Settings → Only Shake If → USB device connected (matches name), then a comma-separated list.
When to use it
Auto-shake when your Time Machine drive is connected. Auto-shake when your audio interface is plugged in. Auto-shake when a specific dongle is in.
Tips
- Use any substring of the device's product name. `Scarlett` matches `Focusrite Scarlett 2i2`.
- Combine with `External disk connected` for belt-and-braces backup-drive detection.