Filesystem                   1K-blocks      Used  Available Use% Mounted on
udev                          32853496         0   32853496   0% /dev
tmpfs                          6581120      4304    6576816   1% /run
/dev/mapper/ubuntu--vg-root  958622848 589639252  320218464  65% /
tmpfs                         32905596   1266068   31639528   4% /dev/shm
tmpfs                             5120         4       5116   1% /run/lock
tmpfs                         32905596         0   32905596   0% /sys/fs/cgroup
/dev/sdb1                       720368    321624     346352  49% /boot
/dev/sdc1                   2883233956 611781088 2124923284  23% /backup
/dev/sde1                   1921811248  96735736 1727383456   6% /media/music
/dev/sda1                   2883233956 428153128 2308551244  16% /opt
tmpfs                          6581116        20    6581096   1% /run/user/123
tmpfs                          6581116       108    6581008   1% /run/user/1000
/dev/sdf1                     15129680        16   15129664   1% /media/paul/TOSHIBA
/dev/sdg1                     15129680        64   15129616   1% /media/paul/TOSHIBA1
tmpfs                          6581116         0    6581116   0% /run/user/1001