Free space on SD card?

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Below is disk usage by Pi-hole (approximatly):

pi@ph5b:~ $ du -chs /usr/bin/pihole-FTL /etc/pihole/ /opt/pihole/ /var/www/html/{admin,pihole} /var/log/pihole*
12M     /usr/bin/pihole-FTL
42M     /etc/pihole/
236K    /opt/pihole/
13M     /var/www/html/admin
32K     /var/www/html/pihole
0       /var/log/pihole
0       /var/log/pihole-FTL.log
60K     /var/log/pihole-FTL.log.1
4.0K    /var/log/pihole-FTL.log.2.gz
8.0K    /var/log/pihole-FTL.log.3.gz
856K    /var/log/pihole.log
812K    /var/log/pihole.log.1
28K     /var/log/pihole.log.2.gz
68K     /var/log/pihole.log.3.gz
76K     /var/log/pihole.log.4.gz
52K     /var/log/pihole.log.5.gz
4.0K    /var/log/pihole_updateGravity.log
68M     total

Below how you can inspect particular folders: