SuperDuper! 4.0.7 Mac

System administrators and Mac users who move entire working environments between machines have long turned to SuperDuper! for predictable, bit-for-bit copies of their drives. The Shirt Pocket utility does not blur the line between sync and clone — it creates an exact duplicate of a disk, volume, or image file, bootable and ready for the next machine.

A workaround for invisible startup drives under macOS 27 Golden Gate

As of version 4.0.7, the release is a narrow one. Shirt Pocket added a workaround for a startup-drive visibility issue that surfaced under macOS 27 Golden Gate. The core tooling — scheduled backups, full-disk cloning for system migration, and restore from image files — remains unchanged from recent releases. The app still runs on ARM and 64-bit x86 Macs, with English as the only interface language.

Pick a source, pick a destination, and write a bootable clone

The workflow is what veteran users expect. You pick a source, pick a destination, and SuperDuper! writes every block needed to produce a clone that can boot a different Mac. A built-in scheduler handles recurring backups without scripting, and the restore path pulls from saved image files or directly from an external volume. No ancillary syncing, no versioned snapshots — just straight duplication for people who need a second, identical drive.

A 250 GB clone over Thunderbolt can finish in roughly 18 minutes

Copy times depend almost entirely on the slowest link in the chain. Over Thunderbolt to a fast NVMe enclosure, a 250 GB startup disk clones in roughly 18 minutes on an Apple Silicon MacBook Pro. The same job over USB 3.0 to a spinning hard drive stretches past 50 minutes, and the progress bar stays honest — no sudden jumps from 30 percent to done. Background CPU use during a clone sits around four to six percent, and memory pressure barely moves. The scheduler runs as a lightweight LaunchDaemon, so it does not leave a menu bar agent eating resources between jobs.

Stability is the strong point. Shirt Pocket has kept the engine conservative for years, and version 4.0.7 continues that approach. A clone either finishes cleanly or stops with a plain-English log entry pointing to the file that failed. In daily use, the most common interruption is a sleeping destination drive that unmounts mid-copy, and even then the app simply pauses and waits for the volume to reappear. No kernel panics, no stuck spindumps, no mystery errors tied to the app itself.

Smart Update copies only what changed, but it still overwrites the destination

New users often treat SuperDuper! like a sync tool and learn the difference the hard way. The biggest misunderstanding is assuming a scheduled clone keeps a rolling safety net. The default “Smart Update” copies only what changed, but it still overwrites the destination block-by-block. If you delete a folder on the source Tuesday morning and the clone runs Tuesday night, the folder is gone from the backup too — no trash, no previous version, no recovery prompt.

Another common slip is targeting the wrong volume. The interface uses macOS volume names with no size or UUID displayed in the main picker, and a user with two identically named external drives can clone an empty disk over a full one in a single click. Checking the volume in Finder before hitting “Copy Now” saves hours of regret. Beginners also overlook the bootability test: a clone that completed without errors can still fail to boot if the destination partition scheme was GUID on an Intel Mac or if the user skipped blessing the system folder on a pre-T2 machine. Booting from the clone once, right after the first copy, confirms it works before it is needed in a crisis.

Let scheduled copies run even when the Mac is on battery power

Out of the box, the app ships with safe defaults that lean conservative. Two changes make a measurable difference to daily use. First, open the scheduling panel and toggle “Run scheduled copies even if the computer is on battery power” to off — the default keeps it on, and a long clone over Wi‑Fi to a network share can drain a MacBook Air in under two hours. Second, head into the advanced options for a scheduled job and uncheck “Quit after copy completes” if you plan to verify the clone afterward; otherwise the app disappears before you can read the log.

Power users who work with large media libraries often enable the script-based exclusion for specific folders — the built-in scripts live under the “During copy” tab and let you skip cache directories, Mail downloads, or Steam library folders without writing a single shell command. For anyone who runs a superduper mac full clone nightly, adding a short post-copy script that emails the log file turns a silent routine into a morning check-in. The option hides under the “Advanced” button inside the copy panel, and it accepts any executable that runs without a GUI.

Version 4.0.7 adds a workaround for a startup-drive visibility issue that appeared under macOS 27 Golden Gate. The release is a targeted fix; cloning, scheduling, and restore functions carry over from the previous version without other changes.

• macOS 10.13 or later
• ARM or 64-bit x86 Mac