Remove attic bracing for storage
The bracing seems to be applied randomly. When we design lateral bracing, it is uniform throughout the structure, (or each section of a structure). 

I doubt the bracing is "required". It was probably installed during construction to keep the components aligned. 

Structural components are designed for "worse case scenarios". So, one way to test my assumptions that it's not required is to remove one diagonal brace and then stand in the attic and shift your weight from side to side. If the structure seems to "move" then it is required. (You should not be able to move the structure.) Then, remove one more brace and test again...

Another way of checking to see if the diagonal bracing is required (designed), is to check the nailing pattern from the bracing to the vertical studs. If it is the same, (say...2 nails into each stud,) then its more likely to be required. However, if it's random, (maybe 1 nail in some studs and 2 in others) then it's definitely temporary.

By the way, take a picture of each area before you start, in case you have to replace the braces.