Let's look a bit at the word "preservation" in the Bible. There are about 6 different Hebrew words that are sometimes translated as "preserve" (including forms ending with -ed, -est, and -eth). The Hebrew words have the meanings indicating a 'deliverence' (salvation), a 'keeping', or 'watching'. There are 3 Greek words that are often rendered in English as "preserve". These Greek words carry similar ideas of 'observing' and 'keeping' (i.e. 'obeying' commandments). There are many, many passages about protection (saving & keeping) which may or may not be descriptions of genuine preservation.
Overwhelmingly (if not singularly), the Bible speaks of God's acts of preservation being towards His people. Remember, these are from KJV verses specifically with a form of the word "preserve" (not passages with a possible concept of preservation). As John mentioned, God is The Preserver of Men (Job 7:20). In the Scripture we find God preserving specific kinds of people such as the "king", the "faithful", the "simple", and of all "Israel". Pronouns in verses used to indicate humans being preserved by God are "us", "them", "me", "him", and "thee". Other words essentially referring back to people are "seed" (Genesis 19), "life", "you a posterity", "soul/spirit/body", "the way of the saints", "from evil/violent man" and "thy going out/coming in". I actually think that the preservation of "Jerusalem" (Isaiah 31:5) is mainly concerned with people (similar to "Israel"). Additionally, I believe the "beasts" (Psalm 36:6) were necessarily preserved for the sake of humanity.
Consequently, there may then only be two other references to preservation in Scripture: Proverbs 22:12 poetically speaks of the preservation of "knowledge"; and Jesus illustrates that the new wine & bottle can "both be preserved".
Except a disputed interpretation of Psalm 12:7 there are no passages explicitly referring to a Divine preservation of written revelation on Earth.