Can I connect a drive via eSata/USB to one connected to MBP via FW800?

I have a drive that only has USB/eSata (Drive 1). I have another drive (Drive 2) that's got USB, eSata, and FW800... it's currently connected to my MBP via FW800.
Is the following possible?
Drive1===>USB/eSATA===>Drive2===>FW800===>MBP
The purpose of Drive1 is only to back up the contents of Drive2, I do not need to transfer anything directly from the MBP to Drive1.
Questions:
1) Is this possible without errors?
2) If so, what performance can I expect?
3) Which is safer/better, using USB or using eSata?

No. Although drive enclosures may have pass-through ports they are for daisy-chaining via the same port. Also, you cannot connect the drive by more than one port at a time without causing a potential dangerous condition for the drive. However, you can connect separate drives by separate ports. That is you can have one drive connected by FW, another via USB, and still a third by eSATA (if you have the requisite ExpressCard/34 card.)
Which is better? From fastest to slowest; eSATA, FW800, FW400, USB 2.0, USB 1.1.
The ideal method for accomplishing you stated goal is to get a two drive enclosure populated with two identical drives. Use Disk Utility to create a mirrored RAID array. What ever is saved to the array volume is mirrored on both drives automatically. The array should not be used as a startup volume, but it can be used to backup a startup volume.

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