When you load in the CFX .res file into CFD-Post that used the backup solution file as the initial values file, on the "Load Results File" panel, select "Load complete history as: A single case". This will display all the transient files from the previous run (up to the backup) and the transient files from the current run in the Timestep Selector.
If you use the default setting "Load only last results", it will only show the transient files generated in the current run.
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