I've been researching the story of Noah's Ark. What many people don't realise is that there were two arks. The second contained several levels and was used to save the freshwater fish.
It was known as the multi-story carp ark.
The switch at the back is not designed to be turned on an off repeatedly, it's not a conventional on/off switch, it's an isolation switch designed to be used on those rare occasions when all power to the PC must be removed. TBH I don't know why people shutdown a PC at all, I never have since...
Personally I use Macrium Reflect free, and have done for many many years. Macrium no longer offer the free version but you can still get it at https://m.majorgeeks.com/files/details/macrium_reflect_free_edition.html.