Linkstation LS-XL data lost after check disk

[paludo]

Hi,

this evening I had the good idea of carrying out a check disk with catastrophic result.
What I did is to click the check disk button under storage menu and checking the "Delete any hidden, non-essential MacOS dedicated files" checkbox.
Result is shared folder completely empty (around 800GB) and a new folder called "lost+found" (around 700GB) with a lot of files with a  a number as name and without extension.

Please, is there anyone out there who can help me in recovering data?

Thanks