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I have transferred test data sets to the server and USB drives to estimate the amount of time required to copy data. The results are below. Bandwidth on the network or computer could change from time to time so I can't guarantee you will always get these speeds. You may even be able to achieve faster speeds.
Transfer of 103 GB via Gigabit Ethernet from the Vox to confocalstore2 on Friday 25th April took 24 minutes.
Transfer of 103 GB via USB 2.0 from Vox to an NTFS formatted portable hard disc on Friday 25th April took 61 minutes.
The data transfer rate from the time-lapse systems to the server is approximately 1Gb/minute, this may vary, but consider this when backing up data for the amount of time you should allow. USB transfers will likely take longer.