Comment by ninkendo
Interesting. How did it work getting your photos off of iCloud? Does Apple give you a good way to get an archive of all of your photos? That is, the original quality photos, without manually downloading them individually? (I currently have 446 GB of photos in iCloud…)
Immich iOS app supports backing up photos directly from iCloud in original resolution, with the all EXIF data included. I had 230 GB of photos myself, and I left the phone on the charger overnight with the app running in the foreground and screen locking disabled. In the morning everything was imported.
Some people have instead set Photos app on a Mac to download original photos from the iCloud library and then moved the files directly into the server. I have not personally tried this method though.