Solutions

We find that the server has established a mirror of disks per board (the information is not directly recoverable), we review the copies of the removable disk and the last recoverable copy is from 8 previous months. The server had Microsoft's Hyper-V mounted and a virtual machine on top with owncloud server.

We establish the base operating system with hyper-v on the new server in a simple way. It's time to recover data. The external disk is checked for the existing worst case if it is feasible and the virtual machine import test is successful. Let's go to the existing internal disks of the old server. A disk is completely unusable (multiple reboots for days have damaged the internal files and when checking the disk it shows them with size 0). We have better luck with the second disk that, although the files have inconsistencies, allow them to be repaired one by one, to establish a base information folder with which to test the import of the latest real information.

The import is tested with the prepared folder and after 3 hours it is able to import it and add it to the hyper-v of the new server. Subsequent repairs are made to the virtual machine, due to inconsistencies in the existing Ubuntu. We finally start by recovering the network interfaces, optimizing memory capacities and performance. We establish automatic copies of the virtual machines and it is synchronized again with all existing clients.