Suggestions for leaving a rarely used Power Mac on?

I have a ~6-year-old Power Mac G5 (running OS X Server 10.5.8 with two 1.5 TB drives) that is used only as a back-up for a RAID5 NAS once per week. The total amount of data on the Power Mac is under 2 TB. (And, if it may be important, the machine has its original 500MB RAM plus an added 2 GB for a total of 2.5GB RAM.)
Because I do incremental back-ups across my wired network from the NAS, this back-up is usually quite fast, perhaps 10-20 minutes.
Other than this back-up, the machine is not used.
My question is about leaving the machine on. I see the options as:
1. Should the machine be left on 24/7?
2. Should it be left on 24/7, but let its disks sleep?
3. Should it be allowed to sleep all week and just awakened once per week for the back-up?
4. Should it be left off all week and just powered on once per week for the back-up?
Thanks for any help.

Hi-
I, personally, would allow the machine to sleep.
The savings in electricity and wear and tear would be tremendous, I would think.
Of course, sleep forgoes the startup process.
The Wake from sleep can be automated for convenience.
In System Preferences/Energy Saver, you can schedule wake in Options/Schedule.
Selecting "Wake fore ethernet network administrator access" may be all that is necessary to automate the process.

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