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#41
If you back up your big drives with disk imaging, for example, the images are compressed, and only contain used data, so will be smaller than the source disk. However, there will usually be a set of significantly smaller images (representing differences with respect to the initial (base ) image, as you update your disk, and update its backup. Reckon on perhaps 1.5x to 2x your used data for an image set, depending on how many different dates you wish to be able to restore to.
Also depends if you use differential or incremental imaging- the latter needs somewhat less space.
If you just elect to keep a single copy (not the best idea) then the storage space you need will be smaller.
There are plenty of backup strategies and tools as I'm sure you know.
Since I started with 8" floppy disks (1.44Mb each if I recall) I don't think I've ever lost anything very significant. Yet.
Of course, if you have super-fast upload speed you could back up to a cloud service if you have enough storage allocated... that would save you the cost of disks, replacements, physically securing them and make your data available anywhere you can access that service. (Might not be so in China, for example).
Last edited by dalchina; 05 Apr 2017 at 09:22.