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Which is the best application to Sync two folders?

I'm looking for a sync'ing program that will keep a current copy of my live data on an external hard drive. It doesn't have to be free, but it does need to be reliable, and somewhat easy to install, set up, and use.

I need one that has

-the ability to detect when a file changes
-then copy only the changed bits (deltas) to make the backup file an identical copy of the live one
-the ability to copy files that are currently in use
-I prefer one that allows scheduling (maybe once every few hours) instead of one that runs constantly in the background

Also, are there any other things I should look for?

(Windows 7, btw)
Thanks

Edit I'm not looking for any internet based solutions like dropbox or live mesh. Thanks.

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What was wrong with this question? superuser.com/questions/100161/… – John T Jan 25 '10 at 5:29
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Or how about this: superuser.com/questions/13493/… – random♦ Jan 25 '10 at 5:30
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closed as exact duplicate by random♦, Ivo Flipse♦ Jan 25 '10 at 6:58

This question covers exactly the same ground as earlier questions on this topic; its answers may be merged with another identical question. See the FAQ for guidance on how to improve it.

2 Answers

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It sounds like Microsoft SyncToy is exactly what you need. It's free too!

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Does it do delta copies? Can you point me to where the documentation says it does? – CChriss Jan 25 '10 at 12:15
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Who deleted my answer?

  1. http://www.microsoft.com/downloads/details.aspx?familyid=c26efa36-98e0-4ee9-a7c5-98d0592d8c52&displaylang=en
  2. http://www.mydigitallife.info/2008/01/01/schedule-synctoy-to-run-and-automatically-and-repetitively/
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nobody, the question was deleted and reposted. – John T Jan 25 '10 at 5:32
Your answer is right here: superuser.com/questions/100170/recursion/100171#100171 – random♦ Jan 25 '10 at 5:32
I accidentally deleted the question. Anyway, taspeotis, does synctoy copy only the deltas? I couldn't find where it did. If so, can you post a link to that info? – CChriss Jan 25 '10 at 5:36
@taspeotis - For a next time, please name the programs you propose, and eventually describe them a bit. Don't just post obscure links without explanation. – Gnoupi Jan 25 '10 at 8:28
CChriss figured it out. – ta.speot.is Jan 25 '10 at 11:47
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