User/library/mirror folder

can anyone tell me what this folder is for (user/library/mirror)? i have a 17" G4 powerbook and dual 2.7 GHz G5 desktop. my powerbook hard drive was full so i backed up the entire drive and did a complete hard drive wipe then reinstalled only the applications and files i needed but found that there was still about 30 GB of "stuff" in this folder hence my drive was still pretty full. i then removed all of my documents that i could get by without (about 10 GB). then one day i noticed that the mirror folder was empty and i have plenty of storage space again.
now my G5 hard drive is maxed out (400 GB) and there is 300 GB of "stuff" the the mirror folder just like my powerbook. i have called apple support and the tech i spoke to could not tell me what that folder is. i then went to the genius bar at an apple store and again no luck.
it seems this folder is some sort of back up or copy of the entire hard drive. it is empty on my power book and it works great. can this folder be purged from time to time?
thanks for the help,
thomas
Mac OS X (10.4.6)
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Do you access your iDisk contents on a regular basis?
Do you have have an always on internet connection?
If so and your internet access is reliable, there is no reason to keep a copy of your iDisk locally on the hard drive.
Unless you have a reason for doing so, I would turn off iDisk Syncing.
I'm not sure why the Mirror folder is becoming so large over short period of time but I would turn off iDisk Syncing as a test to see if it resolves the Mirror folder growing in size over time.

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