Imac system maintenance

Hi,
I've had my imac for just over 2months now and I love it. But, what I'm wondering now is, should I be doing any maintenance on it? (I think I've seen it called "housekeeping" here) It's my first computer so there was no migration from another system,therefore I started with absolutely zero software/data. Now I have around 1000 photos, 1200 songs and a few downloaded items(widgets etc). I'm a newbie so please tell me what I should be doing to ensure my mac keeps working at its best.
Oh and what is the security update? I've updated mac os to 10.4.2, should I download the security update too?
Thanks
Lee
p.s. I leave it on 24/7

Hi Lee,
Mac OS X does almost everything automatically, so you don't need to do much to have it work always at peak performance:
- Always keep enough free hard drive space (10-15%) on the boot drive.
- Back up (using a file-to-file method, -> no cloning every fault on external drives).
- Let the 3 nightly periodic maintenance tasks run (CPU on 24/7 is OK. +since 10.4.2 they run delayed if CPU sleeps at night).
(+ some cautious steps:)
- Repair permissions after each software install that required an installer.
- Clean users', browsers' and fonts' caches before an OS X update (using Yasu, OnyX or such an utility).
- Use the cache-cleaning restart to restart from your Tiger Install DVD and,
- Repair Disk with Disk Utility.
(+ you can also:)
- Rebuilt Directory with DiskWarrior.
The Security Updates are generally good for your system. So are the OS X Updates.
Before applying them, always disconnect all periphericals (+ iPod, HD, etc) and it is a good idea to follow my "cautious steps".
In order to keep them backed up, you can use Software Update's option "Install and Keep Package", or you can download them directly from Apple.
Some good info in those pages:
(The X Lab) Maintaining Mac OS X
(Gulliver) Mac OS X 10.3/10.4: System maintenance
Good maintenance!
Axl

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