Backup Options Tape vs Online, Opinions wanted.

Hello Everyone,

I am currently looking at 2 options for backup, I am currently backing
up aroudn 50Gb per night with 2 DDS4 tapes across 3 windows 2000
Servers using Backup Exec. Two tapes for each day of the month. Any
one tape is only used once a month. We use SQL and have an Exchange
Server.

1) Option one is an online backup were they do incremental backups and
hold 10 versions.

2) HP 448 LTO-2 Tape unit using a different tape each day of the
month (Tapes numbered 1-31). The software would be Back-Up Exec 10d,
and it would be connected using an Adaptec 19160 SCSI Controller. Tape
taken offsite each night.

What is the better option, the costs are similar, one monthly, one up
front.

Thank you for your help.

Darren