Does anyone here have experience in combining their iCloud Photo Library with a local backup to an external HDD using Time Machine? My wife & I are considering pushing our full photo library (around 30k photos) into iCloud, but want to make sure that as we continue to build the library we still own a backup somewhere. This is both in case something goes wrong technically (e.g. we accidentally screw up the entire library during an update), but also in case we ever want to switch to another way of working. I assume we're not the only ones going for such a setup - can anyone here share any experiences and give any tips?