How to create tunnel backup for pravate network subnet

i need tunnel backup if one down on backup tenners.

You can deploy more then one connector (cloudflared instance) per tunnel, called replicas: Tunnel availability and failover · Cloudflare Zero Trust docs
As long as they can all reach the IPs in the Private Network Subnet, should be fine. They all need to be able to service all requests though, for every public hostname/private IP on that tunnel.

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Hi,
i have created two tunnels but adding private network CDIR error showing A Error: You already have a route defined for this exact IP subnet

You don’t want to create two tunnels. You want only one tunnel, and to create replicas/multiple connectors/instances of cloudflared running that tunnel.
There’s a guide here: Tunnel availability and failover · Cloudflare Zero Trust docs

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