Required Solution Architecture,Linux,Virtualization,VPN,System Administration freelancer for mirroring concept in nextcloud job

I have nextcloud installed in server. it has a static ip so my employees can access it from within/outside the office LAN. I wish to have a mirror copy of this server happening into another server which is kept besides this nextcloud server. idea is, whatever operations are happening in this server should be mirrored in new server in real time basis. so, if anything happens to this nextcloud server then I can immediately shift to the mirror server.

I also want to keep an incremental backup of this nextcloud server on daily basis in another NAS or HDD.

also, I want to open the file on this server on double click when accessed by client. presently, I have to download the file, make changes and re-upload the same.

I am using linux centos 7 in nextcloud server and wish to continue with linux only.

Skills & Expertise Required

Solution Architecture Linux Virtualization VPN System Administration