My Cloud disk replacement: how to do?

Hi to everyone, I have got a WD My Cloud 2TB (single bay), which I use not only to store movies and photos, but also to automaticaly store documents from a network scanner. So I was happy to use this device that allows me to manage users and shares, and to adapt its interface to the needs of the scanner.
Unfortunately the NAS fall down from my desktop. Although the NAS didn’t recognize the disk anymore, I was able to recover most of content before the hard disk definetely died, by unmounting it and connecting it to a PC running Ubuntu Linux.
Because the NAS was working very well, I’d prefer reuse my present NAS instead of puchasing a new one. Therefore, now I’d like to replace the disk, either with a disk of the same type (WD Red 3TB) or with another with more memory. But while recovering the data, I noted that there are several partitions in the disk, with operating system and software I guess.
So, my question is: can I simply buy a new disk and connecting it to the previous hardware? Is there some automatic configuration procedure in the NAS hardware? Or must I manually create the partitions, install the firmware (taking it from where?) and configure it? In this case, is there some WD tool for doing this configurations?
Thanks a lot to everyone who can give me help or some suggestions!

Regards
Adriano

The data partition is either partition 4 (for first gen unit) or partition 2 (for gen2 unit). In either case, it is physically the last partition on the disk.

The other partitions contain operating system and configuration data.

Since it is the last partition on the volume, you can usually clone the drive onto the new one with something like dd, then extend the data partition to fill the remaining space.

Failing that, you can follow one of the debricking guides to set up the new drive fresh, then copy the data over.

Thank you Wierd_w for your kind reply. Unfortunately, the oiginal HDD is defintely dead, I don’t believe to be able to clone it nor to recover any informations about the number of partitions and their size.
My question was just to know if there is something in the MyCloud Hardware to automaticly create the setup (partitions, firmware and the environment) needed for the operation of the NAS. I’m understanding that this configuration is up to me.
Could you please help me to identify where I can find the “debricking guides” you are speaking about?
Thanks, Adriano

This one has a convenient set of links Bennor put together.

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Thank you a lot, Wierd_w! I’ve read Bennor’s remarks and I’m understanding that the work could be hard but not impossible.
I’ll learn and try.

Regards
Adriano