Photos
If I have all my photos on my Mac with iCloud, will they delete if I delete them off my phone?
MacBook Air 13″, macOS 10.15
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Yes. iCloud Photos is a syncing service. Any photo you delete from a device where iCloud Photos is turned on will also be deleted from iCloud and from any other device connected to iCloud Photos. You can potentially reduce the storage space required on a device by turning on Optimize Storage. See: https://support.apple.com/en-us/HT204264