Hello, probably a way too obvious answer, but here goes...
Is it possible to override specific parts of the Isis (or any) administrator template, just like with the front-end?
Thanks
Yes. Put your overrides in administrator/templates/isis/html
Is this in <site root>/administrator/templates/isis.html ?
Because that's where the original ISIS template resides, and my changes may be lost on future Joomla updates.
I suppose I cannot override (or make a 'child' for) another template. I would have to make a copy probably. Correct?
You can duplicate & rename the template if you wish. See http://www.knowledgebase.ibuild.ph/how-customize-and-override-joomla-isis-and-hathor-backend-administrator-templates