How to free up space? node uses more than 8 GB space

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Thanks fot the tip, it was usefull as my /usr/local/n/versions/node has all upgrades since 12 and up to 14 packages and uses up to 2.3Gb, while /opt/node_n is 930Mb.

# lsb_release  -a
No LSB modules are available.
Distributor ID:	Debian
Description:	Debian GNU/Linux 10 (buster)
Release:	10
Codename:	buster

yunohost -v
yunohost: 
  repo: stable
  version: 4.3.6.2
yunohost-admin: 
  repo: testing
  version: 4.3.4.1
moulinette: 
  repo: stable
  version: 4.3.3.1
ssowat: 
  repo: stable
  version: 4.3.3.1

# grep -nr "nodejs_version:" /etc/yunohost/apps/*/settings.yml
/etc/yunohost/apps/etherpad_mypads/settings.yml:19:nodejs_version: '14'

So i did proceed to remove the old versions that where storaged under /usr/local/n/versions/node