The thing you have to remember is Mac OS X is based on BSD Unix. So some routine Maintenance schedules automatically run late at night if you keep your Mac running. These are log cleaning files called Cron. The problem arises if you let you Mac Sleep at at night or shut it off at night. Luckily there are more Freeware programs to force Cron to run then you can throw a trick at. I personally like one trick ponies that do one thing and one thing only. So to run Cron at my will, I use Macjanitor. There are other programs that are free, but you have to check to see if they can work in Tiger.
The other preventative maintenance tip is already built in. It is Disk Utility in Applications->Utilities. Just startup up the program, select your startup drive and Repair Permissions. This should be done around every two weeks or after any large software install (or a bunch of small program installs). Every software maker think they have the most important program and will mess with your Unix (Mac) permissions. Disk Utility compares the software receipt files (/Library/Receipts) to the actual file and sets the permissions to what they are suppose to be. So never delete the receipts.
These two steps are a good start to preventative maintenance in OS X.
Mac Pro Dual 2.8 Quad (2nd gen), 14G Ram, Two DVD-RW Drives, OS X 10.9.1
2006 Mac Book Pro 2.16 (first Gen) OS X 10.7.5
2TB Time Capsule, 2 TB
32G iPhone 4S Black, iPad (3rd Gen) 32G Black