下手の横好き世界5 by William Van Hecke

Sparse bundle!

Wow, I just discovered the “sparse bundle” feature in Mac OS X Leopard. It’s a disk image (which you can encrypt), but it only updates the chunks inside it as necessary, so that Time Machine can still back it up efficiently. This is really nice for me, because I keep my Journler database in a big 2-gigabyte encrypted disk image, and if I keep up with my writing schedule Time Machine would back up the whole dang thing every other day. So if you are in a similar situation you should use sparse bundles. Thanks Apple!