ChronoSync takes the pain out of syncing between Macs
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ChronoSync takes the pain out of syncing between Macs

If you have multiple Macs -- as many of us do -- you should certainly look into ChronoSync. The US$40 utility offers a way to synchronize or backup files and folders. You can synchronize between folders on your Mac, other Macs, PCs, external drives or anything you can mount on your Mac.

Let me admit that I mainly use ChronoSync for synching, as I have Time Machine and a Time Capsule that I use for my back-ups. What I really like about the software is its "intelligent" synchronization. It identifies and copies only the files that have changed since you last synchronized.

The most common need for synchronization is to simply maintain a redundant backup of your data. In this case, all the changes made in one target, the main target, will get copied over to another target, the backup target. You may never directly access the files on the backup target; they're there as a backup in case something goes wrong.

In this scenario, ChronoSync would be configured to perform a backup, blind backup or bootable backup synchronization. It does this well, but, as I mentioned, I use other products mainly for this (though you can certainly use ChronoSync along with Time Machine for double insurance).

Another common need for synchronization is to keep two sets of files that are actively modified in sync with each other -- which is how I use ChronoSync. My main computer is my 27-inch iMac. However, I also have a MacBook Air. I use the Econ software to perform a bidirectional synchronization between the two.

However, you can use ChronoSync as it best suits your needs. It uses a document based interface, which means that all your configuration settings as well as specific information about the set of files being synchronized are contained in a single document. This document may be saved anywhere on your computer's hard disk. Likewise, a ChronoSync document can be opened at a later date by simply double-clicking it from the Finder. This differs from an application-based interface where only a single set of data and options are presented.

ChronoSync lets you create two types of documents: synchronizers and containers. A Synchronizer document contains all the information necessary to synchronize two targets. A Container document contains one or more Synchronizer documents.
A ChronoSync Synchronizer document contains all of the information necessary to keep two targets synchronized with each other. This includes a reference to each target, the type of synchronization to be performed, numerous option settings to control ChronoSync's behavior and zero or more rules to inform ChronoSync of what type of files need to be synchronized.

A Synchronizer document also contains a snapshot of every file being synchronized in each target. This snapshot is referred to as the synchronization tree because it maintains the same hierarchical relationships of files and folders as they exist in your targets.

A Container document contains one or more Synchronizer documents that have been previously saved. So you can synchronize several Synchronizer documents in one step. You simply drag documents in and out (or click the Add or Remove toolbar icons) in the Documents panel.

Running a synchronization on a container will execute each contained Synchronizer document in the listed order. Synchronizer documents in a container can be rearranged by dragging them, affecting the order in which they run. In most other aspects, Container documents behave just like Synchronizer documents.

The synchronization operation is specified on a Synchronizer document's Setup panel. ChronoSync offers nine synchronization operations. These operations have five variants, Backup, Blind Backup, Mirror, Bidirectional and Bootable.
When it comes to, for example, synching a desktop and laptop, the first step to setting up a Synchronizer document is to decide which computer will be responsible for the synchronization.

Econ recommends that the "responsible" computer be the one that connects to the other. In my case, that means the "responsible" computer is my iMac, and the "target" computer is my MacBook.

One misconception that many users have is that they have to install ChronoSync on both computers and set up a synchronization document on both computers to perform a sync from one computer to another. Doing this isn't necessary; in fact, Econ doesn't even recommend it. Since ChronoSync has the ability to do bidirectional syncs, one document can analyze the contents of the files for both computers, synchronizing in either direction when necessary. Because of this, ChronoSync needs to be installed on only one computer.

If you are going to backup or synchronize to another computer you need to connect to it. There are two basic ways to connect to another computer: Network or Direct.
The Direct method is simpler and faster as you can connect two Macs via FireWire. But if FireWire is missing (a la the MacBook Airs), you'll have to use Ethernet or connect to shared computers and servers using a network address.

That may sound complicated, but it's really not, though you'll have to spend some time learning all the ins and outs. Basically, here's how it works: you set up a Synchronizer document to schedule and automatically mount volumes so your syncs and backups go smoothly. Archive your data and "go back in time" to restore and view older files. With ChronoSync, you can not only copy data, you can manage it too. You can exclude files and folders, check the current sync status of files, even run trial synchronizations to see what will happen before it happens.

ChronoSync also lets you create bootable backups. With it you can create a complete copy of your hard drive and boot directly into the backup. Additionally ChronoSync gives you full access to the entire hard drive so any files can be copied. The app also features a modified "Sync Engine" logic to use less memory and scan files faster, resulting in speedier synchronizations in most cases.

ChronoSync sports templates that provide the ability to create Synchronizer and Container documents with customized settings. The Setup panel contains a Readiness status that displays any issues between the two Targets being synchronized. The Archive feature now supports file compression saving you disk space.

There are lots more features of ChronoSync, but these are some of the highlights. If you want a fast, flexible tool for synching and back-ups, look no further.

Rating: 10 out of 10

Also, Econ offers a companion product: ChronoAgent. The utility runs on a destination Mac and communicates directly with ChronoSync. Normally, when you synchronize or back up to another Mac you mount it using file sharing. However, you only have the same access to that Mac as the user you mount as. This means that other user accounts and system files are off limits.

ChronoAgent bypasses file sharing, giving you full access to the destination Mac and eliminating the need to mount via AFP, SMB or other protocols. It can even match Users and Groups of files between two different Macs giving you full preservation of file ownership and permissions.

ChronoAgent runs in the background as an invisible application and is controlled in the System Preferences of your Mac. ChronoAgent only communicates with ChronoSync, meaning you need to have ChronoSync in order to communicate with ChronoAgent. ChronoAgent for Mac is a separate purchase and sells for $10.

ChronoSync and ChronoAgent for Mac will run natively on both Power PC and Intel-based Macs running Mac OS X 10.5 and higher. A demo is available for download.


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