Free folder syncing software that can run as process or service

I was wondering if 开发者_如何转开发there was a folder syncing software out there that would sync a network (smb) folder to a local folder. There are a few that i have googled:

1. Puresync
2. Allway Sync ...

To name a few. But the catch is the syncing process stops as soon as the user logs off! I need something that would keep on running as a process without any user login! thanks Cheers

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Get Dropbox i think its the best for sync.