Do you recommend any method to clean the database of unused thumbnails? I’ve tried a couple plugins but looks like they aren’t fully compatible with wpestate and won’t recognise several used images (the slider’s previews, for example).
As the website gets bigger, the unwanted weight of all those unused images get backups very annoying.
I don’t have any suggestion for a plugin to do that. You may be using un-attached images for featured or slider, or agent, or testimonial. There is no way to separate what is used or not from un-attached images. You would have to delete manually what is not required anymore. It’s the best idea I have.
Also, you can increase storage. Nowadays hostings can offer TB or storage, so this space should not be an issue.
And you can install a plugin like Resize Images on upload so you set the max size (and not allow adding images larger than needed). 1920 max width images covers all resolutions.