Help! All data in mybook live gone and owner password unknown

Should consider myself “lucky” that remote access of my MBL has been Disabled some time already due to modem settings and unable to connect to internet. I still have access to my data on the device through local network and Win10 computer.
I did not look to remedy this because of an bad experience with an new WD dualbay NAS last december. Within 24h this device got hijacked and if i would pay some bitcoin to get my data restored.
Did not pay, most of my pictures will stiil on the camera’s/phone so i could recover the important stuff. returned the device to supplier. Learned an lesson not to connect an NAS and stept “back” to old style external backup drive for save keep. The old MBL as an local convenient mirror of this to quickly acces files.
Sorry to say but from now i keep away from NAS devices and WD products.