Please use below sample script to backup windows event logs,
Example : Backup application logs
import os;
if not os.path.exists(r'C:\backuplogs'):
os.makedirs(r'C:\backuplogs')
out=os.popen("wmic nteventlog where filename='system' backupeventlog c:\\backuplogs\\system.evt").read();
print(out);
out=os.popen("wmic nteventlog where filename='application' backupeventlog c:\\backuplogs\\application.evt").read();
print(out)
out=os.popen("wmic nteventlog where filename='security' backupeventlog c:\\backuplogs\\security.evt").read();
print(out);
out=os.popen("wmic nteventlog where filename='setup' backupeventlog c:\\backuplogs\\setup.evt").read();
print(out)
out=os.popen("wmic nteventlog where filename='forwardedevents' backupeventlog c:\\backuplogs\\forwardedevents .evt").read();
print(out);
sample output would be,
