Create storage partition
A local storage partition will be used, to hold the clonezilla backup of all other partitions.
Check partition number and unallocated disk space
The extended partition has number 4 and ends at sector 1702858751. There is some unallocated disk space available.
Expand and verify extended partition
This is an interactive command. See output.
We'll use all remaining unallocated (free) space. First use the sector found in step one. This will fail. See output.
Just create it. No need to mount it.