Looking for advice on free file sync software

[Shetlander]

OK, this is what I want to do. I have all "My Documents" on a seperate 250gb drive and would like to mirror this onto my external Buffalo Linkstion so that the files can be accessed from my EEE without the main computer on.
I am looking for a FREE program that will track changes made on either drive and make the necessary adjustments on the other (copy, delete etc).

I have so far come across a few programs,

Synctoy - appears to do what I want but wondered if there was any problems with long file names etc. Does this work in the background?

Allway Sync - Does what I want but has a limit of 20,000 file syncs in a 30 day period without paying for a Pro licence.

Ideal software would be something that would sync both drives in the background, bi-directional, using a GUI (comandline I havnt a clue), making changes nearly as they happen.

Open to alternative suggestions as this is my first steps into networking and file backups/syncing.

 

[Shetlander]

OK, tried Synctoy last night. All worked fine and out of over 20,000 files it complained about the file length of 4 of them. Other than that all went well.
I havnt put it into scheduled tasks yet but probably will later.

Does anybody know of a FREE program like Synctoy that actually tracks files changes and copies the differences as you go?

 

[Shetlander]

Yes, thats what I did when it found them.

I think it might have had something to do with the fact they where files, within a folder, within a folder .....

Greenlizard0

Will have a look at Syncback. Thanks

 

[Shetlander]

But if Im not mistaken, Synctoy doesnt monitor file changes in the background. You either have to schedule it or tell it to do it.

I am looking for something that is free and does the above also.