How can I make TrendServer/OPCServer machinres redundant in Freelance 800 system .
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I'm sorry, but right now it is impossible to have two TrendServers in a project. The limit was and is one TrendServer per project.
Now OPC servers is another topic - You can create multiple gateway stations (OPC) with similar access rights - even if one station fails, You have other servers to access data. That is not redundancy per se, unless You can make Your OPC client automaticly reconnect to redundant gateway station on OPC communication failure.
And data archiving is yet another topic - all the data in Freelance system is archived on Operator Stations - neither Trend Server nor OPC Server has anything to do with it, unless You use one of them to pass data to Your OS (for example TrendServer to Trend Display with archiving features enabled).
Maybe it's not very helpful, but maybe at least informative.