The former owner of my boat had a 50 kg D'Hone anchor as a main anchor and kept a 30 kg D'Hone as a spare anchor.
When I changed to a 50 kg Sarca Excel I kept those 2 anchors on board as well. I thought they could be handy in case of.......
The ony time I used the 30 kg anchor was when we stayed in Kos Mandraki during the winter. The boat was sideways to the prevailing wind and so I dropped the 30 kg anchor off to starboard with a 40 mtr chain / rope connection. At the end of the winter I had to hire a diver to get the anchor back out of the soil, it was solid stuck.
We never had to use both spare anchors again, so in the end I gave the 50 kg anchor away to a family member and the 30 kg anchor is now in storage in a container.
My approach is now that if I would lose the main anchor it is definitely not my day. I can always retrieve the anchor since am using an anchor buoy with a 1200 kg break line attached to it. And if the chain would break it would mean that anchorage is not the place to be. We do have heavy storms in our sailing area, but I never had the need for a second anchor.
Must say that it creates space if you remove stuff off the boat that you basically don't need. Also had 2 spare props onboard, they are now also in the container. There is no way I will jump into the water to change the props myself, so we would need to come out of the water, I get in the a car, go pick up the props and drive back. At most that would be a 3 day drive, think that is acceptable.