Fear of losing all my photos:
I am trying to turn on icloud photos on my ipad, but I am afraid to because it prompts me with:
Photos Synced from Finder will be Removed.
Syncing photos via Finder is not supported when icloud Photos is turned on.
12096 photos will be removed.
Am I deleted photos only from Finder or from everywhere?
iPad, iOS 9
When you turn on iCloud Photos on your iPad, any photos on the iPad that were placed onto the iPad by syncing them from a computer (Mac Finder or iTunes in Windows or Mac) are deleted from the iPad. The photos are deleted from the iPad but not from the computer they were synced from.
Normally, those photos would still be on your computer (assuming that you didn't delete them from there) and you could manually upload them from the computer to the Photos app at iCloud.com and they would then sync back to the iPad via iCloud Photos. You could also AirDrop them from the computer to the iPad or turn on iCloud Photos on the computer and that would result in them being synced back to the iPad.
This is also discussed in the following excerpt from Get help with iCloud Photos - Apple Support
Any photos or videos that you copy to your device through iTunes or the Finder are not copied in iCloud Photos.
Upload originals from your iPhone, iPad, or iPod touch to your Mac
To upload original, full resolution versions of your photo library to your Mac, turn on iCloud Photos on your Mac.
Copy photos from your Mac to your iPhone, iPad, or iPod touch
Upload photos from your PC
Learn how to upload photos and videos to iCloud Photos
When you turn on iCloud Photos on your iPad, any photos on the iPad that were placed onto the iPad by syncing them from a computer (Mac Finder or iTunes in Windows or Mac) are deleted from the iPad. The photos are deleted from the iPad but not from the computer they were synced from.
Normally, those photos would still be on your computer (assuming that you didn't delete them from there) and you could manually upload them from the computer to the Photos app at iCloud.com and they would then sync back to the iPad via iCloud Photos. You could also AirDrop them from the computer to the iPad or turn on iCloud Photos on the computer and that would result in them being synced back to the iPad.
This is also discussed in the following excerpt from Get help with iCloud Photos - Apple Support
Any photos or videos that you copy to your device through iTunes or the Finder are not copied in iCloud Photos.
Upload originals from your iPhone, iPad, or iPod touch to your Mac
To upload original, full resolution versions of your photo library to your Mac, turn on iCloud Photos on your Mac.
Copy photos from your Mac to your iPhone, iPad, or iPod touch
Upload photos from your PC
Learn how to upload photos and videos to iCloud Photos
iPad photos to iCloud sync
