I have an older (est. 2008) Macbook Pro running the Snow Leopard OS (10.6.8), with a 250 GB hard drive, 2.4 GHz Intel Core 2 Duo Processor, and 4 GB 1067 MHz DDR3 memory. I do have an external hard drive (WD Passport 500GB), where I keep a lot of old stuff, backups, movies/video, etc. I do however have a number of apps installed also which I rarely use, if ever... which I'll see about storing on the external hard drive, I don't know if I can put actual apps on there to be run off of it... but other than apps, the bulk of my internal hard drive space is taken up by my music (~50GB) (which I also need to consolidate, as I suppose is the usual case)... But just in general, I know there's a lot of hidden stuff and miscellany that is not easily identifiable or discerned, so generally how would I go about maintaining the optimal health and performance of my Macbook, clean it up a bit, tighten up the loose ends? I installed Onyx, but I don't really know what to do with it. I also installed something called Monolingual, which is supposed to clear your hard drive of unnecessary language packs automatically downloaded along with most app installs... though I don't really know if it's necessary or worth having. Any advice or info you could offer me would be greatly appreciated, thanks a lot.