Really great program for keeping Folders or Drives synchronized. Gone are the days of manually running rsync or some other utility—with Synk you just set up a synchronization rule, turn it on, and from then on you will always have up-to-the-second synchronization.

I think the price could be a bit lower, but in the end the ease of use and stability of this app justifies the price, especially if you use it to keep many drives/folders in sync.

One note of complaint though, and I'm not entirely sure it's the fault of the program: I had this running on my early 2010 Mac Mini Server to keep a live backup of the OS drive, and I had to turn it off due to extremely high CPU usage. It would fluctuate anywhere from 60–140% of 2 cpu cores (ie-140%=100% first core and 40% second core). However, I run several scripts on my 2007 MacPro, including a live backup of the OS, and cpu usage is negligible. I have no idea what the issue is with the Mac Mini.

Remote sync stopped working since I moved to Lion (despite the suggestion to delete items in my Keychain). This has been the most frustrating piece of software I've ever purchased. The auto mode (when working) was a dream. The manual mode is a nightmare and it's apparently intended to be. After contacting the developer multiple times it's clear to me he feels it's working as intended.

I did give it an extra star for making the uninstall painless.

I have been trialling Synk 7 on and off since March. I have probably sunk at least a whole working week in trying get it to run. But its behaviour is still erratic and the reasons for it are close to impossible to tracking down. And Decimus has been unable to give me any help or pointers besides nice words of encouragement.
And since Synk 6 is non-functional on Lion thus have to consider Synk abandonware.

The key problem is that Synk 7 almost never manages to get my boot drive into sync, pegging both my processor cores fully for 12+ hours (the most time I can give it during a weekday).

I have spent the last two weeks again tracking down what is tripping Synk 7 up. I successively reduced the workload from 3 million, to 2 million, to 500000, to 200000, to 100000, to 20000, to 3000 files by excluding stuff. None of these managed to get into sync by running it overnight. I then went the other way around, not by excluding stuff from by boot drive but by merely syncing individual folders. That worked well and miraculously after some successive buildups of number of files under considerations, syncing the whole boot drive worked (ie, it managed to get into sync).

Unfortunately, trying it again today, there is still no sign of it getting into sync after 4+ hours. My best guess is that the rare successes I had with Synk 7 are all down to luck, ie, there are one or more processes that cause Synk 7 to effectively hang itself but I have no clue what it is. Since my computer is usually running around 140 processes (counting the PIDs), finding the offending one by trial and error is anything but trivial.

And in their great wisdom, Decimus (or shall we say Benjamin Rister) did not build-in any debugging tools that would show me which folders (or files) are causing Synk 7 to never finish, thus essentially abandoning all their customers which have a slightly non-perfect system (with Synk 7 not working and Synk 6 also not working anymore on Lion).

Of course, they say, I should just look at the list of activities but more often than not this list is empty (whether that is a sign of Synk 7 having half-crashed or 'just' a UI bug is naturally an open question). And that Synk 7 can peg my processors with basically zero disk activity for several minutes does look much more like Synk 7 hanging itself as some external process causing it to re-scan a folder.

Naturally, Decimus could give me a debug build of Synk (one that simply logs what it is doing, making it maybe possible to say where it gets stuck). But that seems outside their technical or resource or goodwill range.

Decimus has abandoned the non-live sync backup market (they market Synk 7 as a live-sync tool and have stated to have no interest in adding a non-live mode to it). As has the creator and lead developer, who has left the company.

Thus, I too should probably abandon Synk and Decimus. I am sure there is some great work inside Synk 7 but launching a new product that at same time abandones a good deal of your customer base is not something that creates a lot of trust into their product.

Thus, as a warning to all potential buyers of Synk 7: Don't feel too comfortable using it as a backup tool for your boot drive (where lots of processes constantly write files), it might stop working at any moment.

What is live syncing with this app like on very large files say a 4GB file? I assume if I make changes this app will sync the 4GB file over from scratch as I work slowing down my machine? 4GB or so even on an SSD is not instant by any account over a ethernet to a file server.

Is this app made for people just using tiny little office files not those working in media? I notice the demo vids all show little files. But what about huge files how does it cope with those?

Good or Bad over traditional manual or cron based syncing for large files is my question?

One of my best software purchases EVER!

I've been using Synk Pro for about four months to synch my MacBook Pro, my office machine, and my MacBook Air, my travel laptop. I've had absolutely no problems linking User folders, Home folders, Apple Mail, and six special folders each pertaining to a different critical project. The system works flawlessly.

It even worked all right with Snow Leopard on the Pro and Lion on the Air, but as I never liked Lion -- it's a toy, not a serious OS update, and it resulted in a burnt out logic board -- both machines are now running SL. No matter. The settings work whatever the combination.

I don't even have to think about it, SP is doing its job. I can grab the Air and run out the door confident that all the folders and files I need are right there. Support on the few occasions I needed it, early on, has been personal and on the money.

I doubt that I'll give up Synk Pro for the iCloud. Despite Apple's efforts to make synching easier, most of their networking efforts have gone off half-assed and besides, Synk Pro already works.

I rate SP straight five-stars. (The one 4.5 below, Features, is an artifact of MacUpdate. It deserves five stars, too.)

Buy this software, it eclipses the competition and will make you smile.