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#121
One of the main reasons besides the flexibility for having an identical second OS drive beside for testing as well as looking at dual booting is any possible hardware fail of the main drive. There I can restore an image made until eventually seeing another clean install at some point which is not uncommon.
It does preserve the software purchased however which won't always allow continous reinstalls rather then the need to buy the same versions of the same programs over and over. The actual fast and reliable way of seeing any dual boot setup is not restoring images but clean installs on each drive.
Here everything is already covered on one drive alone as far as softwares and running several VMs to look at other OSs. Anything on the second drive is merely a temporary option.