More than one Time Machine drive

I'm about to upgrade to a Mac Book Pro at work, which will be my first use of Leopard on a work computer. (My Aluminum Powerbook at work sits at 10.4.11 right now.) I do have a Mac mini running Leopard at home, so I'm familiar with Time Machine. With my work computer, currently I maintain two Retrospect incremental back-up files and toggle between them. I started doing that after a Retrospect back-up file got corrupted and I no longer had any file history. With the new system, I'd like to set up two time machine drives. One would stay in my office and would be the main time machine drive. The other would be portable, and would help me keep my work backed up when I am on extended travel. I would also like to back up to the second drive at some regular interval (say weekly) when I am not traveling to keep it fairly current. Will Time Machine handle such toggling of backup drive gracefully? When I switch back to the main Time Machine drive after backing up the the portable drive, will incremental backups resume on the main drive, or will it start a full backup again?
thanks!

Nope. I do not use TM as I find it to be very unreliable and poorly suited to anything other than basic backup for inexperienced users. I use other backup applications that do scheduled backups to my backup drives. I would never try to have multiple backups on a single drive as it is unsafe. If the drive were to fail or become corrupted then both backups are lost. It's not a good backup strategy in my opinion. For backup I recommend:
Backup Software Recommendations
My personal recommendations are (order is not significant):
1. Retrospect Desktop (Commercial - not yet universal binary)
2. Synchronize! Pro X (Commercial)
3. Synk (Backup, Standard, or Pro)
4. Deja Vu (Shareware)
5. Carbon Copy Cloner (Donationware)
6. SuperDuper! (Commercial)
7. Intego Personal Backup (Commercial)
8. Data Backup (Commercial)
The following utilities can also be used for backup, but cannot create bootable clones:
1. Backup (requires a .Mac account with Apple both to get the software and to use it.)
2. Toast
3. Impression
4. arRSync
Apple's Backup is a full backup tool capable of also backing up across multiple media such as CD/DVD. However, it cannot create bootable backups. It is primarily an "archiving" utility as are the other two.
Impression and Toast are disk image based backups, only. Particularly useful if you need to backup to CD/DVD across multiple media.
Visit The XLab FAQs and read the FAQs on maintenance, optimization, virus protection, and backup and restore. Also read How to Back Up and Restore Your Files.

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