Are you getting Time Machine no Mountable File Systems error ? You are using a Mac system and you are fully dependent on Time machine for all your back up needs. Time Machine is a back up up utility that is inbuilt in the Mac system. It automatically saves a back up copy of the files of your preference at regular interval of time. This utility saves the back up file in an external hard drive called Time capsule. You have to first manually setup the time machine and then it will automatically start creating back up. When you need the back then you have to start the backup process in which you can either restore a particular file or the whole system. But sometimes the Time machine does not work correctly and start giving Time Machine no Mountable File Systems error. It is not a type of problem that a novice user can rectify you will need a professional to fix Time Machine no Mountable File Systems error. So to recover data from your system you can rely on Mac data recovery software. It will perform a deep scan to recover any deleted data and restore it in the intact form.