Linksys WRT1900ACS, VPN

I want to install VPN but there is no "Free space". How can this problem be solved?

root@OpenWrt:~# df -h
Filesystem                Size      Used Available Use% Mounted on
/dev/root                 2.3M      2.3M         0 100% /rom
tmpfs                   250.0M    756.0K    249.2M   0% /tmp
/dev/ubi0_1              24.0M     24.0M         0 100% /overlay
overlayfs:/overlay       24.0M     24.0M         0 100% /
ubi1:syscfg              29.6M    288.0K     27.7M   1% /tmp/syscfg
tmpfs                   512.0K         0    512.0K   0% /dev
/dev/sda1                 1.8T    140.6G      1.6T   8% /mnt/Bkup
type or paste code here

Please help!

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