Photos Library size is different when on MacBook and then backed up to external drive
Due to size of Photos Library for years can get big quick. I decided to libraries by year and copy it to external drive. The copy for 3-4 years is about 335GB on MacBook and I did make sure using terminal command du -sh. When I copy it to external drive, it becomes approximately 560+GB. The difference between sub folders on MacBook vs external drive is mostly because of "Originals" folder.
Any reason? how to solve this issue?
MacBook Air 13″, macOS 11.4