DirSync Pro is a powerfull, easy to configure tool to synchronize the content of a directory to another. It can compare (e.g. size, modified-date, ...) and synchronize an unlimitted number of directories and has a detailed logging-function.
one of the best
The new interface didn't make it clear whether the 'delete' function was enabled or not, so I still use this one that doesn't tell you it's version when you do 'Help' > 'About', but has the older interface that still lets you have the 'Delete' checkbox unchecked. Today it decided to 'Analyze' 280GB, and when the meter reached 90-some%, start over from 0% again, so is taking longer than the hour I'm used to it taking to sync. This old version crashes with some devspeak java error maybe 5% of the time it runs, and there are numerous annoyances like the files it dumps in the place you run a saved job from, and the inability to let you set what the defaults are instead of always having to do a 'different than defaults' configuration. Even with all that's wrong with it its still in use because it still does the checksum on what it copies & that's what it's for. Every time I run it I wish it was more than 'almost right' for the task.
Only good for small transfers. Can't handle 400GB. Doesn't do anything about copy operations that fail the checksum. Just warns- won't retry. GUI doesn't show transfer speeds. Only uses 1 core. No option to transfer files whose hash doesn't match the original- Just new, larger or modified. 3 identical projects on SF snuffs out competition by occupying SF's "similar projects" recommendations.