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You can certainly keep your old Universal Analytics property while starting to use your new Google Analytics 4 (GA4) property, to ensure that all tracking is ongoing while you adjust to the new system. It won’t affect your GA4 data. Whether to keep the old UA tracking code or not, it completely depends on your requirements. Regarding the old events, GA4 will not automatically transfer them. GA4 works with a different event model than UA, and you’ll need to set them up manually in GA4 once again. Old ‘ga(‘send’) events can’t be directly transferred. The GA4 event model is more flexible and allows for more customization so you might consider mapping out how you want to track events in GA4, and implement those changes gradually. Also, though your existing UA property won’t stop working after July 1st, Google will stop creating new properties in UA, hence building comfort with GA4 will be useful for future analysis.
