The auto installer, Softaculous is known to have many problems. No doubt other parts of the install could be bad.
When did you do the auto install?
It's not logical for the "backup" to affect the site, install yes, but not a backup.
I did a backup of the site via the hosting installer bundle "Softaculous" and then there was no tiny_mce anywhere any longer.
Actually the initial installation went well with no glitches. After the backup of the install to use as a cloner for other future installs I discovered there was no wysiwyg instance.