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I have 4 devices on same Apple ID. Latest things are there on the iPhone I use. It has about 3500 contacts. For some reason the other devices have less and not-updated contact list. How do I ensure that when I backup on icloud, the latest 3500 contacts of my iPhone are the only ones which get updated across all 4 devices. Also, is there a possibility I lose my contacts on the iPhone during backup if icloud updates from some other device?
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I have 4 devices on same Apple ID. Latest things are there on the iPhone I use. It has about 3500 contacts. For some reason the other devices have less and not-updated contact list. How do I ensure that when I backup on icloud, the latest 3500 contacts of my iPhone are the only ones which get updated across all 4 devices. Also, is there a possibility I lose my contacts on the iPhone during backup if icloud updates from some other device?

Updation of contacts on icloud

The iPhone is a smartphone made by Apple Inc. It and the iPad, along with several other mobile devices from Apple, run on the iOS operating system, which has its own topic, as does the iPad for device-specific questions. Native iOS applications are written in Objective-C or in Swift using the Cocoa Touch frameworks or HTML5 compiled with the help of a package manager such as Adobe PhoneGap; a common IDE is Xcode.