Quoting etiquette?

[kallima]

Hey all, just wanted to get a quick consensus regarding quoting. If I am responding to a post that immediately precedes mine, is it necessary to quote or redundant? If I don't hit quote though, sometimes there will be additional posts by the time I have gotten through typing mine.

If it's a long post or has photos I will generally use the spoiler tag to save space but was just wondering is there a forum etiquette for this type of thing? Just don't want to unnecessarily clog up a thread!