Full Answer
Parallel implementation approach: 1. Leave existing client-side tracking in place 2. Install server-side tracking alongside it 3. Run both for 2-4 weeks 4. Compare: Do both show similar conversion counts? 5. Once server-side proves reliable, disable redundant client-side Why not start fresh:
- Client-side is backup if server-side has issues
- Historical continuity in GA4 during transition
- No data gap during implementation period
- Risk mitigation: If something breaks, you still have data Only fully deprecate client-side after server-side proves 90%+ capture rate for 30 days.