To avoid disk filling up on my pod I’d like to delete old uploads (eg images) periodically. Can anyone suggest a safe method to do so? Thanks in advance.
It’s never ‘save’ to delete something.
If you completely delete a user (aka Close its account) photos will be removed.
As a podmin, my recommendation is: increase size of your hard disk. I did this recently on my pod. It was a online procedure without a reboot.