Again, I said Reliable MEDIA not reliable Tape Drive. Two of our AIT tapes started Tearing the Tape Media. it cost something like 300$ to fix.
Secondly - I never Dropped an HDD in my Entire Life. Let alone HDDs "park" the Magnetic head so Even if you dropped the HDD most chances the Data on the disc can still be salvaged. Currently I have W.D. 6/4 Gb sitting in My Motorcycle trunk that I use as a removable media for the last 3 years. never had any problems.
Don't forget that Tapes are more suspectable to EM and Environmental conditions.
I don't think you should backup your entire drive Daily - a Incremental/Diffrential Strategy is wiser in your case.
Signing off (my girlfriend is waiting...),
Gabriel
