The problem with backing everything up to DVD is that it isn't readily available. If it is all on a HDD then you can access it quickly (as long as your house keeping and file structure is tidy).

Also I hope you are using good DVDs to make your backups? These days I only use Verbatim discs with AZO+ metal dye. All other makes use organic based dyes with degrade and corrupt the data over time. Most are only suggested to last up to 10 years, whereas Verbatim state at least 30 years, with over 100 years being the real estimate. Also Verbatim discs can be read in a lot more drives than other makes. Definitely worth paying the slight extra for them.
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