This tip is for people new to Time Machine and curious about internet files on their computers. Time Machine is a great new addition to the Mac OS X experience. However, while it’s nice to have your entire hard backed up, there are files you might NOT want sticking around on your computer taking up space, much less backed up–like any temporary Safari files.
The files that we all probably get rid of regularly are cache files, history files, and, more than likely, downloads that you’ll undoubtedly erase or move right after download (like large disk image files that you’ve already used). But with Time Machine running, how can we REALLY erase these files securely/forever?
Cache files - The good news is that, according to Apple and the Apple support forums, temporary cache files are ignored by Time Machine altogether. You can see this by opening your “cache” folder, going into Time Machine, and seeing all the empty, black windows behind the current one.
History - In case you didn’t already know it, you can exclude certain items from being backed up by Time Machine. In other words, you’re telling it to “ignore” something when it backs up. While it’s usually a good idea to back up everything, you might want your browser’s history file ignored. It’s as simple as entering Time Machine preferences, clicking “options,” and dragging the file/folder you want ignored into the list. I chose to ignore the files in this path: “user>library>safari>” You may want to choose other files, but that’s up to you.
Downloads - Obviously, there are many files you download from the internet that you want instantly eliminated from your HD, but unless you delete them before Time Machine’s next backup, you won’t get rid of them. To rectify this, just add your “downloads” folder (or wherever you save things to) to Time Machine’s exclusion list as above, and those pesky files won’t outstay their welcome.
Obviously, every user is different, so make sure to make your “exclusion” choices carefully. (I, for example, use my downloads folder as a temporary folder, but you may not). As a side note, take care when excluding System level directories, as doing so makes it harder to restore your system if your disk becomes damaged, etc.
written by rockmsockm
\\ tags: Leopard, time machine