Ed Mullen wrote:
> 
> You can get a new external USB 1 Tb drive for about $60 these days.
> 

The point is having more than one in order to have duplicated and separated
copies.

You need also extra room for keeping differential backups, means for
integrity checks both in the backup and the original, and keeping a history
which goes back enough in the past. The idea is that if a file is corrupted
today and you don t realize until 2017, you have a way to rebuild the data
as it was just before the corruption.

That means at least two hard drives (for having separated copies) that are
in fact bigger than the original drive.
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