[Hampshire] Backup strategies

Hi all

I'll keep this as short as possible - I've written this message 3 times
and each time it's turned into a story...

What's the best way (hardware solution) of backing up 300+Gb of data?
I can't store it off site.. Frequency of backup is about once a month.

Options I've considered
1) DVD - even Blu-ray is only 50 odd Gb isn't it - so even max
compression wouldn't work?
2) Tape - nothing approaching that much capacity.
3) HDD - preferably NAS but probably USB and left completely
disconnected when not in use to avoid power spikes etc.
4) Some sort of commercial backup where the files are stored deep
underground most likely in Siberia. Not only costly but with an upload
of only 256Kbps across my domestic broadband - 300Gb is going to take
ages.

Have I missed anything?

Cheers
Rob

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