Using 'DeltaCopy' feature
The 'DeltaCopy' feature lets you continue a copy operation after
a network failure or connection interruption from the place where
the fault occurs and not from the beginning.
Radmin uses 'DeltaCopy' automatically when you copy any file to
or from a remote computer. For each section of source and
destination files, Radmin calculates a control value, and this
value (several bytes) is transferred to the other computer and
compared. If the sums are equal no data for section is sent over
the network and the system examines the next section in the same
way until it finds a section that has not yet been copied.