Okay, this is one of those topics that gets me nerdy-excited: the seven books usually singled out as deuterocanonical — 'Tobit', 'Judith', the Additions to 'Esther' (often treated as part of 'Esther'), 'Wisdom' (the Wisdom of Solomon), 'Sirach' (Ecclesiasticus), 'Baruch' (including the Letter of Jeremiah), and 1 & 2 'Maccabees' — show up in a patchwork of ancient manuscripts and translation traditions. The big umbrella is the Greek Septuagint tradition, so the chief witnesses are important codices like 'Codex Vaticanus', 'Codex Sinaiticus', and 'Codex Alexandrinus', which preserve many of these books in Greek. They’re not all identical in what they include or where the books appear, but these three are primary LXX witnesses.
Beyond the Greek, the Latin tradition (the 'Vetus Latina' manuscripts and later the 'Vulgate') carries virtually all of these books in Western churches. Then you have other ancient translations — Syriac, Armenian, Georgian, and Coptic manuscripts — which often preserve one or more deuterocanonical books that might be missing in a particular Greek codex. Archaeologically, Qumran (the Dead Sea Scrolls) delivered fragments of some, especially 'Tobit' and texts related to 'Sirach', so there’s even Hebrew/Aramaic backing for parts of the collection.
So, in short: look to the major Septuagint codices ('Vaticanus', 'Sinaiticus', 'Alexandrinus') and to the Latin and eastern translation traditions if you want surviving manuscripts of the seven deuterocanonical books.