Is back-up to TWO external drives possible?

Is there a trick anyone knows of to use two backup disks for time machine?
Here's my situation:
- two 150GB external drives (total of 300GB for backups)
- need to back up ~240 GB from the computer to these drives
- only one destination drive is allowed by time machine, so it won't even start the initial back up as the source files are greater than 150 GB (the size of one external drive).
- I know file exclusion is an option, but I have over 150 GB that needs to be backed up! I can't exclude enough to make them fit....
So, I have enough space for backups, but it's on two external disks! Is there any way to get time machine to accept or use both drives? Anyone know of any tricks?
Thanks!
Selena M.

How big a drive depends on what you're really backing up. You noted you used to back up your system; you might be unaware that a "system backup" in TM is not the same thing as what you used to do (well, I'm assuming a bit here - that is, you wouldn't be able to "fix" a corrupted system just by dragging your TM backup stuff onto your main drive again).
The size of the backup drive also depends on the kind of work you do. If you do video or heavy-duty Photoshop stuff, those files, and their incremental backups, take up a lot of room. If you surf, email, and use word processor, those are compact files whose incremental backups take up tiny amounts of space. Also consider that, although you currently have 240 gig on your drive, lots of that is System and Applications, and very little of that changes, so the initial backup is almost the only copy of that stuff that's going to go on your backup drive.
In all, Apple's occasional recommendation of 2.5 times the size of your working drive for the size of your TM drive is, for many, or most, people, not necessary. In all likelihood, 500GB is going to be fine. In some of my experiments, I've used a 30GB (not a typo) backup drive for my laptop's 120GB drive, backing up only my User-folder stuff with no problem, using it for many weeks. While I don't do a lot of iPhoto stuff, and no movies, I do have tons of Word documents, and half-tons of large InDesign and Photoshop files. I had plenty of room for the initial backup, the current one, and 2-3 weeks of interval backups. (No system backup, no Applications folder backup, excluded things like the Trash, etc).
When you get your new drive - don't discard the old ones - or, at least, keep one of the old ones. Make it your emergency startup drive, with a system on it in case your main system goes wonky; also, use it if you use something like Entourage, or a PC-emulation software - you don't want TM backing up those files, but you should be backing them up, and an occasional drag of those files to your "special backup" disk can be lifesaver.
s.

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