I have gone through guides where it's stated that clearing the files in
/var/cache directory is perfectly safe.
After I cleared it I experienced a backend issue. Saving configurations ended up with a server error, and didn't go through.
Stopping nginx and starting it generated an error:
Starting nginx: nginx: [emerg] mkdir() "/var/cache/nginx/client_temp" failed (2: No such file or directory)
Luckily I had a backup tarball of the