Ubuntu Server disk cloning + saving on another disk in network

This my first question here and bear with me if some info is missing. So, i have this technical problem: I have a Ubuntu Server installed on a Raspberry Pi 4 Model B ( so on ARM ) and i need to do a full backup and upload it on another PC in the same local network ( A Windows PC ). This is the server FS:

| Filesystem    | Size | Used | Avail | Use% | Mounted on      |
|---------------|------|------|-------|------|-----------------|
| tmpfs         | 375M | 6.4M | 368M  | 2%   | /run            |
| /dev/sda2     | 110G | 38G  | 69G   | 36%  | /               |
| tmpfs         | 1.9G | 0    | 1.9G  | 0%   | /dev/shm        |
| tmpfs         | 5.0M | 12K  | 5.0M  | 1%   | /run/lock       |
| /dev/sda1     | 253M | 138M | 115M  | 55%  | /boot/firmware  |
| tmpfs         | 375M | 4.0K | 375M  | 1%   | /run/user/1000  |
| total         | 113G | 38G  | 71G   | 35%  | -               |

I thought of maybe set up a fileshare ( like SAMBA ) on my windows machine and putting the backup there. I never did Linux backups and i don't know how to make one, so some questions: - What is the best way of creating a backup? - I need to backup sda1 and sda2 ? - Best way to port it on another machine with different OS ? - Once i have the backup in hand, with a pristine new SSD, how i import it onto it? Feel free to ask me if you need further info, thanks in advance!