Maintain EntryID when copying entry to another site

We have 2 versions of our site setup, The live site and a backup site.

We are setting up a cron that will send new entries from the live site to the backup site, if first checks to see what the last entryID in the backup version is, and gets any entries newer than that.

The problem is that when the entries are added they are given a new ID, and so entries are added multiple times, until the entryID catches up. How can we force the entry added to have the correct entryID?

Thanks
Will

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