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Which ARM devices are you talking about? ROS on ARM is in some cases possible (e.g. running a Linux system on an ARM board, such as the Beagleboard), but there aren't many user out there AFAIK. This Q&A gives an insight: http://answers.ros.org/question/10716/ros-on-arm/
As cagatay already mentioned, you will need to sync your machines (your ARM boards) by hand or with tools like chrony. A Q&A on this topic: http://answers.ros.org/question/11180/chrony-configuration-and-limitations/
Regarding the actual synchronisation of your data, you have to keep in mind that the data is usually time-stamped on creation. Once you request data, you would get the most recent one. So you need to implement some mechanism to align your data. I recommend to look around for existing code & projects, since data synchronisation is common problem.
But after all, I say, yes it is possible! :-)