Best Size For Back Up Disk?

What is peoples experience with the best or minimum external HD size to use with hourly back ups via Time Machine? I would imagine that at least double the GB of the drive that is being backed up would be necessary, but should it be even greater? Or less? and why?
I need to know before I buy an external HD. I don't want to regret getting something too small in the long run.

artistjoh,
It is generally recommended that you use a volume at least twice the size needed for the space being consumed on your startup volume (in other words, based on your disk usage, not the size of the disk). IMO, anywhere between 2x and 3x the size needed will do just fine.
Here's one nice thing about Leopard, though: we can now dynamically partition and re-size "live" drives and volumes (provided we use the GUID partition scheme)! The implications for Time Machine usage are great, here. I recommend you get the largest (and fastest) external drive you can find, then partition it for use with Time Machine. This makes a lot of sense anyway, because one's cost per GB goes down as drive size goes up (up to a certain point).
You can partition the large drive using the GUID Partition Scheme, creating one volume of an appropriate size for your current Time Machine needs, and a second (or third, fourth, etc.) for your own use. If you find at any later time that it would be beneficial to expand the Time Machine volume, subsequent partitions can be deleted, then the Time Machine volume expanded into the resultant free space. Only the data on the "deleted" volumes will be erased.
The only requirement for this usage is that the Time Machine volume be the first one on the drive (at the top of the volume diagram in Disk Utility's "Partition" pane).
Scott

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