For the past 20 years or so, most camcorders have recorded on to tapes (...).
Tapes offer several advantages: they are cheap, readily available and easy to archive (all you do is put them in the cupboard and forget about them).
But with the advent of miniature hard drives and solid state memory, camcorder manufacturers are in the middle of transitioning their products from a tape-based line-up to newer formats that record on to solid state memory, hard drive and even Blu-ray and DVD media (...).
Choosing a solid-state or hard-drive-based camcorder over a DV means you'll need to ensure your computer is powerful enough to handle processor-hungry video files. Also check that you have enough spare storage space to backup and archive your footage
A number of experts suggest keeping two external hard drives around to keep multiple backups of your digital footage
With two hard drives you can actually keep three copies of your footage: one on your main hard drive, one on the backup hard drive connected to your computer, and a third copy of the footage kept on another hard drive off-site.
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Of two things the moon, the other one it is the sun 