Memory growth/leak when using high waveform queue sizes and starting an FTP transfer

I'm unsure if this is a bug, or expected behavior.

Basically, when acquiring 32 channels of AI at 30 kHz we set a high queue size so we don't lose data. If we then start an FTP transfer, we see the memory usage increase. We're unsure if this is a leak, or if we're running out of bandwidth to our hard disk and thereby filling up the allocation of the queue. But wanted to put it up here as an FYI. 
