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Is there a utility I can use that will take a backup of my flash drive every time I insert it into the computer with out me having to take any action?

I would prefer something that runs on Mac and Windows.

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I also recommend SyncBack. I think the difficult part of your question is how to auto-start the backup on inserting the USB card/stick.

You could follow this tutorial on the SyncBack Knowledgebase which shows how to run SyncBack from an external storage device. Create autorun.inf file and let the SyncBack exe start with your backup profile.

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+1 on the autorun, I should look into that myself – Ivo Flipse Jul 27 '09 at 14:02

Copied from my own question. Though you do have to schedule or start the syncing, but for the rest it doesn't really require any more attention after you set it up.

Else check this topic: Which is the best application to Sync two folders?

You could run a freeware synchronization program. I've used SyncBack (freeware) and I'm very happy with it. I use it to synchronize some folders to as NAS at home.

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Or use SyncToy from Microsoft in the past - although do note that version 2.0 does have issues with syncing to NAS devices.

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Nice to see you're happy with SyncBack! – splattne Jul 27 '09 at 13:51
Haha you wrote it? It was literally quoted from my own question, BUT I did install and used it myself. Does exactly what I needed, so yes I do like it myself as well! – Ivo Flipse Jul 27 '09 at 14:02
+1 for quoting such a good answer! ;-) – splattne Jul 27 '09 at 14:27
Well, Ivo, we found a way to send each other instant messages adding comments to our answers. :-) – splattne Jul 27 '09 at 15:10
Now I'm going to post a question on how to steal rep from you ;-) – Ivo Flipse Jul 27 '09 at 15:55

I use SyncToy which is a free application from Microsoft. it has a pretty slick UI and is also accessible from the command line which makes it easy to automate syncs from Windows Task scheduler

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I remember one called USBFlashCopy that would launch on connecting the drive. I'm on a phone so I can't link, but it is a good piece of software.

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I use the free DirSync pro.

I suspect it will work in Mac as well as windows.

Rather than take a backup I synchronize to a directory on my home computer. I've written an AHK script to ensure that this only happens on the machines I want it to. I then compiled the AHK script and call it in autorun.inf

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