I suggest that you spend your money on good backup software such as Second Copy or AIS Backup and ensure that you have a pair of drives on which to store your your work. Work stored on at least two external drives should be relatively safe. Follow that with periodic copies to some other media which is stored off site in case of fire, flood or earthquake.
With 90+ GB of images (I'm just an amateur) the process of copying to optical has become sufficiently onerous that I no longer do it more than once every couple years - if then. However, 90GB is way too much for on line storage - even with a big pipe. I'm just not going to spend the money for a big tape unit. I might consider another USB drive and simply rotate them in and out of storage every 6 months or so.
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