Ubuntu 20.04 Backing up disk using GParted how are UUIDs handled?

[Bo Berglund]

My Ubuntu 20.04.6 LTS Server has a single disk that is a bit too small, so I
figured that I should use GParted standalone to copy its partitions to a new
bigger drive.
I have GParted on a bootable Ventoy USB stick.

And while doing that I might only bring along the server and its used
partitions.
I might also enlarge/create a data partition on the copy using the extra space
on that drive.

But my /etc/fstab file has these entries:

UUID=ec0e8708-8a6a-4bbf-93ba-0a09b1e2ddc1 / ext4 errors=remount-ro 0 1
UUID=a77b40db-2377-4d25-b304-8d233664d1ca none swap sw 0 0
UUID=42BE-49BB  /boot/efi vfat umask=0077 0 1
UUID=389c6db9-3256-47ed-b67f-c11c76eed17f /home ext4 nodev,nosuid 0 2
UUID=fb4a08b7-378e-42eb-9b7a-2c7b4f85cd06 /var/lib/svn ext4 nodev,nosuid 0 2

As you can see the partitions that are mounted use UUID values to define which
is mounted where.

Now to the questions:

1) UUID
If I copy the partitions themselves to another bigger drive as a backup or for
migration, will the UUID of the partitions stay the same or are they
re-generated so the source and destination can be told apart?

2) Use of new disk
If UUIDs stay the same, can I then put the bigger drive into the PC and boot it
up and expect Ubuntu to come alive?
That would essentially make it a backup drive copy....



-- 
Bo Berglund
Developer in Sweden