I'm a little curious as what the Pros vs. Cons are for using a USB Flash Drive for my Time Machine. My reason for this is I often unplug my current external HDD as it is loud & randomly awakes from sleep (it's a Western Digital). Therefore, I'm never backed up to date. Anyways, whatmare the Pros and Cons? Pros: No moving parts, silent, Small Cons: Cost, read/write is slow(er) Is a flash drive less reliable than an external HDD?