Copy anything, anywhere
Kick off transfers straight from Finder. Duplicate adds robust Copy and Paste menu items that pick up where the built-in versions give up.
Finder power tool
Duplicate
Paste entire volumes and deep folder structures without failed copies or permissions drama.
- Adds Copy and Paste menu items that succeed on multi-terabyte jobs.
- Preserves metadata so clones stay bootable after the paste finishes.
- Keeps Finder familiar—no new windows or background daemons.
Why power users rely on Duplicate
Metadata intact
The engine preserves permissions, ACLs, and bless data, so pasted system volumes remain bootable without additional tweaking.
No more failed copies
Large transfers resume safely, report progress, and complete even when Finder would otherwise error out part way through.
How Duplicate works
-
1
Select the source
Control-click a volume or folder in Finder and choose Copy with Duplicate. The app reads the structure and prepares an exact clone.
-
2
Choose the destination
Navigate to the external disk, network share, or second volume where you want the copy to land and pick Paste with Duplicate.
-
3
Let it finish cleanly
Duplicate keeps file permissions, extended attributes, and blessed system files intact so the destination works exactly like the source.
Need a verified backup before you wipe a Mac? Clone it first with Mac Backup Guru.
A closer look
Duplicate places enhanced versions of Copy and Paste into Finder. They behave exactly like Apple’s originals, but they are engineered for the tough jobs: terabyte-sized folders, volumes with complex permissions, and bootable system drives.
It is one of the few copy utilities that passes the Backup Bouncer test, which verifies that every fork, ACL, and metadata bit survives the transfer. That makes it a dependable companion for labs, classrooms, and anyone who wants a perfect copy without loading another full backup suite.
Duplicate can even copy an entire bootable volume. The moment the paste completes you can select the destination disk in Startup Disk and reboot from it.
Downloads & support
- Current release: Duplicate.zip
- macOS High Sierra & Mojave build: Duplicate_High_Sierra.zip
- Uninstall: Disable the Finder extension in System Settings → Extensions, then drag the app to the Trash.
Need help cloning something tricky?
Share the source, destination, and any error messages. We’ll help you figure out the safest workflow.