With ChronoSync can sync or do a backup for most devices and directories, and all that can be connected to the Mac, including a folder on your Mac, other Macs, PCs and external drives.

possibilities:
• Fully customizable toolbar
• All settings are stored in separate files that can be edited at any time
• Synchronization in two directions
• drafting rules to filter the files by various attributes
• Compare files before sync
• Run a test to verify the results of synchronization before performing operations
• history of synchronization, which can be printed or saved to a file
• Automatic synchronization on a schedule
• Use AppleScripts to automate synchronization.

What's new in version 4.5.4:
• Fixes a bug that could cause excessive resource consumption when a Daylight Savings Time transition occurs in some geographic regions.
• Minor interface fixes.
4.5.3
• The ChronoSync system menu now displays OS X 10.10 Yosemite-compatible icons.
• Migrated away from several OS X 10.10 Yosemite-deprecated APIs.
• There's now a much shorter delay presenting results when performing a Trial Sync if a large number of files do not exist on one side of the sync.
• ChronoSync now automatically asserts a volume's 'Ignore Ownership' state to OFF when performing a bootable backup.
• Update checks are now performed via a secure connection.
• Default preference settings have been changed.
• Most notably, "Show Document Organizer on Launch" is ON and "Automatically Show Document Organizer" is OFF.
• We also do not post scheduler notifications by default anymore.
• Fixed a cosmetic issue in the Trial Sync selector sheet that could prevent the proper display of icons in the File / Folder information pane.
• Fixed some animation glitches on 10.9+ systems.
• Fixed various issues that could prevent enabling the "Local Volumes (Admin Access)" option on mis-configured systems.
• The Installer will no longer report that ChronoSync is running and must be terminated if the ChronoSync Express Scheduler happens to be running.

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