THIS. IS. AWESOME. absolute must!
Probably most useful app for those who need to reduce the size of their iCloud Photo Library My use case: Step 1) On a macOS (can be even a virtual machine, you don’t need to make Apple rich if you don’t enjoy macOS UI) you open Photos app, then export your photos to your self-hosted storage (CIFS or your preferred clod storage). You can do this as well without a mac, using File Explorer app or even the native Files app - the idea is to offload your originals away from iCloud Step 2) Open this app and compress all videos, then delete all originals. This way you can keep your memories in iCloud but at an efficient space utilisation ratio. Anytime you need the original (but seriously... do you ever need that?!), look it up in your non-iCloud storage ;)