Partition of external hard drive for backup different computers

I have a macbook(40Gig) and an iBook(80 Gig); I want to make an external hard drive to backup.
1. Is this possible to partition the external drive into two to make a bootable backup for both laptops?
2.If so how big the external drive should be?
Many thanks

1. Is this possible to partition the external drive into two to make a bootable backup for both laptops?
Yes. Set up a partition for each on the external and then clone a bootable copy of your current drive to the appropriate partition.
2.If so how big the external drive should be?
At least 40 + 80 = 100 GB. You're probably going to end up with an even bigger drive. I'd set up partitions to roughly match each of your computer drives in size (so 40 GB and 80 GB), then another for any extra. Having them match size makes it easy when cloning. Don't forget that if you store files on the extra you will also need to back those up on yet another drive.
Cloning And Backup Tools
A bootable clone is an exact copy of your drive which is capable of booting your computer. Making a copy of your computer which is capable of actually starting the computer requires special copying procedures. Some people just back up data files but if you have problems you have to reinstall all your operating system and all your applications. With a bootable clone you just start up from the backup drive and clone back everything.
To copy files from one hard drive to another hard drive you can use:
[CarbonCopy Cloner|http://www.bombich.com/software/ccc.html] (donationware)
[SuperDuper|http://www.shirt-pocket.com/SuperDuper/SuperDuperDescription.html] (shareware)
[IBackup|http://www.grapefruit.ch/iBackup/index.html] (free)
The Restore function of Disk Utility included in OS X. [Kappy's directions|http://discussions.apple.com/message.jspa?messageID=8799711#8799711]
[Tri-Backup (commercial)|http://www.tri-edre.com/english/tribackup.html] (payware)
[Silverkeeper|http://www.lacie.com/silverkeeper> (free) - version 2 has some issues (references: [1|http://www.macintouch.com/readerreports/backup/index.html#d12jan2009],
[2|http://www.macintouch.com/readerreports/backup/index.html#d13jan2009]) and it is recommended Tiger users stick with 1.1.4.
[Kappy's Backup Software Recommendations|http://discussions.apple.com/message.jspa?messageID=9065665#906 5665]
[Overview of Mac OS X Backup Programs|http://8help.osu.edu/1247.html]

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