online backup in critical systems

Hello

Im working with postgresql since version 7.0.x and im very very pleased.
the DB is incredible and work very well.

Lately i been asked to work on a project which require Data safety.
means to avid data lost because fail of hardware or software.

I thought of Replication or / and dump + log SQL commands to a file (
changes since the dump ).

I will be happy to hear the list opinion of how to archive that and i
hope my question will help other to understand what is needed for 24x7
systems.

I also read about arkeia solution, is it part of what i need or i can do
it other wise ?

Thanks :) and keep up the good work

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