Can't access file after reinstallation of the system

Hi,
so recently i have upgrade the hardware of my server. And I have found out the server is not stable, so I had to reinstall the whole system(dietpi Debian OS). And after install the new system and nextcloud. All accounts made before are wiped so I can’t access the file.
The files (around 1.2TB)stored before is still in disk but I can’t find them.
Is there anyway to fix such a problem?
thanks!

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