Well, I have tried multiple scenarios
1) I installed Ubuntu on my macbook using VirtualBox - I got no luck back then - the hard-drive from the Iomega NAS was plugged in to the mac and recognized by the mac. The mac is seeing this hdd as a hdd without a partition map.
If you want to do this you'll have to map the drive to your virtual box. I'd recommend using a live cd/live USB drive anyway, that makes things less complicated
2) I booted on another computer - the HDD was directly connected to the SATA of the computer - somehow this was the strangest part. I tried on this CPU Ubuntu and the HDD wasn't seen at all there. I assume that maybe there's a CPU issue
did you connect the power?
What I try to do now:
1) create a bootable knopix usb.
2) connect the hard drive on a first step to the PC with the USB rack - if I don't succeed, connect directly via SATA port.
Knopix should work, though you can also create a live USB for ubuntu or another distro if you want that.
Any other suggestions?
They're highly appreciated! I have my life on that hard drive... This determined me to buy cloud storage once everything is recovered
Is the nas the only place you have your data on? That's never a good idea. Important data should have at least 3 duplicates, one of them off-site and on at least 2 different storage media (eg. cloud, nas and your pc/laptop) NEVER ony have 1 copy of your important files, even if that's in the 'cloud'. The 'cloud' is not infallible. There are plenty examples of data getting lost even though it's in the 'cloud'.