Second Copy is not available for Mac but there are a few alternatives that runs on macOS with similar functionality. The best Mac alternative is GoodSync, which is free. If that doesn't suit you, our users have ranked more than 10 alternatives to Second Copy and three of them are available for Mac so hopefully you can find a suitable replacement. Other interesting Mac alternatives to Second Copy are SyncBack (Freemium) and DirSync Pro (Free, Open Source).
GoodSync is a high-end professional easy and reliable file backup and file synchronization software. The software automatically backs up and syncs your files between any computer, mobile device or drive; with or without using the cloud.
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Most users think GoodSync is a great alternative to Second Copy.
DirSync Pro is a small, but powerful utility for file and folder synchronization. DirSync Pro can be used to synchronize the content of one or many folders recursively. Use DirSync Pro to easily synchronize files from your desktop PC to your USB-stick.