Size of photo library seems way less after re-downloading all photos
I am using Photo iCloud Library for my Photo library. On the Mac OS Photos app, I have the setting to download all my photos locally (the total size is around 50GB).
After a bit of tinkering, i managed to somehow break the sync, where my Mac Photos library was no longer syncing with the iCloud library.
This led me to create a new photos library, set it as the system library and simply re-link with iCloud and let all the photos re-download.
All working well so far, but the thing that confused me is this new library is only around 8GB in size, compared to the previous 50GB.
It doesn't appear to be trying to re-download any local photos, so im a bit confused as to why there is such a large disparity in size between the new and old library.
Any helps are advise would be much appreciated.
Cheers,
Andrew