Technical problem with server, how to avoid downtime?

I have 2 servers. One server is very busy and second one is for backups only.

Busy server has some problem with hardware and I need like 8 hours to replace the parts.

Busy server will be down on Saturday night.

What I need to do is transfer all data from busy server to backup and run those websites temporary there.

My question is: How can I make this happen with no downtime?

Any help is appreciated.

Thanks

 

 

 

 

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