Replace boot drive

[Jack McGee]

It's probably time to replace my boot drive on my desktop running 16.04. 
  I bought new 2TB spinning disk much larger than existing.

What is best way to do this?  I have backups of
dir2="/home"
dir3="/etc"
dir4="/usr/local"
dir5="/var"
dir6="/opt"

I also have WindowsXP partition (when I moved to Ubuntu) I would like to 
keep but not absolutely necessary.

this is the boot disk:
Disk /dev/sda: 298.1 GiB, 320072933376 bytes, 625142448 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x45334533

Device     Boot     Start       End   Sectors   Size Id Type
/dev/sda1  *           63 593923049 593922987 283.2G  7 HPFS/NTFS/exFAT
/dev/sda2       593924096 625141759  31217664  14.9G 83 Linux

This system has a boot drive and data drive.  I'm not sure if the XP 
installation is on which drive.

Is best to install 16.04 from scratch, then restore backups, if so what?