The answer to this question depends on your home institute facilities. If you have a DLT4000 tape, use the DLT4000 drive on w2p2ins, while you should use the DLT7000 drive on w2p2drs if you have a DLT7000 drive at your home institute. If in doubt, consult your system manager. Compression capacity is as given by the manufacturer. Science frames are between these two values, and typically around 2.
All numbers are approximate.
A full, unbinned WFI image is 141546240 bytes. If using 60m or 90m DATs, scale capacity accordingly. Write time may increase drastically if smaller blocking used. Figures were measured using the wfits script.