The main results of a band calculation are stored in the RUNKF file. If you save this file you can use it to restart your calculation. The input for the restart calculation is essentially the same, except for some extra keys, like Restart, Grid, and DenstiPlot
The DOS section that outputs information of the SCF solution can be executed with key Restart, subkey DOS and orbital plots can be obtained with subkey OrbitalPlot. Likewise, plots of the density (and many other symmetric properties) can can be obtained with the key DensityPlot. Density and orbital plot restarts require the specification of the Grid key. With the subkey SCF you can start the SCF procedure with the last solution from the restart file. This can be useful if the SCF did not converge. Also if you have changed some settings that should have little effect, like the integration accuracy, the restart SCF option can help you to save a few cycles. Similarly, a geometry optimization can be restarted with the subkey GeometryOptimization
Restart key
