Whats the difference between wifi sync and icloud?

Good afternoon...am a little confused about syncing over wifi with itunes and wirelessly with icloud.  Right now the computer I sync my devices with is an older macbook that can't be updated to Lion.  I am confused though by wifi sync ability...does my macbook have to be up and running while my ios devices are powered to sync or will the devices sync anywhere to the icloud?   Since my macbook can't update to Lion will I still be able to take advantage of this icloud goodness?  My macbook is not my main computer but it has all of my itunes content and playlists.  Hope this made sense.

My first question is this: Have your devices all been updated to iOS 5? Assuming they were running 4, then updated to 5, all your data should be on the device. From here, if you were to sync everything to the cloud, all your data will be in the cloud. It will take all the info from your devices and sync it to the cloud. However, make sure on each device you choose what you want to sync, because it will pretty much make everything the same accross all your devices. Obviously your classic isn't going to be included, so you will still need to sync that, but with the phone and the ipad, you will need to decide what you want to sync between the two. I don't own two separate devices, so I don't know exactly what the conduct between the two is, but be carefull when syncing them to the cloud.

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