I have lost my original photos from my local drive if I optimized my iCloud library?

I moved my photo (900 GB) library on an external drive. The value in pictures new external player as the new library system library. Now when I turn on iCloud it tells me I have to optimize my photos. I'm afraid of losing my originals from my local drive. Optimization of my library will erase my originals from my local computer? I have to delete my old library in iCloud that has already gone through the pain staking the download process (759GB) in order to reuse my iCloud? I try to avoid to keep my computer another 3 months. Simply cross ICloud cannot check the new library with my iCloud library and move on. How can I start again using my iCloud? Please give me some advice or assistance. Thank you

The value in pictures new external player as the new library system library. Now when I turn on iCloud it tells me I have to optimize my photos.

What is your external drive only has 1 TB of storage?  You have found the warning because the 900 GB in iCloud and the size of your current library on the external hard drive will not fit on the disc. If you have a disc, use a drive twice the size of your library of Photos, so you will not miss storage in the years to come. Any drive that you use with pictures must have Mac OS Extended (Journaled) file system.

iCloud library does not know, the pictures are identical. It will download all the photos in the library moved to iCloud and check if they are duplicates. And it only allows you to introduce you, if you use 'Optimize', if the combined size of the photos in iCloud and on your Mac is larger than the available storage.

And Yes, the "optimize" option can cause some originals will be deleted. It is completely dynamic.  You can turn this option off again directly after that you turned the library on the external drive as your iCloud photo library for re-download all original, and before Photos was able to start optimization. Do it only if you are sure, the library will fit.

If you do not all projects in your photo library and did not use the function "Faces" and has invested a lot of work by naming the faces, you could simply start with an empty library on your external drive and let the photos to download icloud to the empty library. It will be faster to download again and the merger of the library moved in your library to iCloud. The only downside, the tags of faces will be missing and your books and other projects. If you need to keep a backup copy of the library has moved.

Tags: iCloud

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