Database replication solution for analytical purposes

Hi,
I want to create a mongodb database replication solution for analytical purposes.

assumptions:

  • online updated data,

  • in addition, I want to create other objects in the database - different from the database that I replicate

  • I want to import some data from another database: redis database

Question:

  • What solutions do you recommend

  • how to export / import online selected data from the redis database?
    Thanks for help.
    Regards
    Janusz