This is going to be a bit of an odd question.
I remember when purchasing a SAN before (EMC Clariion CX3-20) I wanted it to back up all live data on the SAN to another volumen or LUN (believe this is snapshot) and then it would back up to tape every 2 weeks .
The live data amounted to about 4TB. I remember a colleague saying that I should really get approx 16TB of disk space, as to ensure growth for backup data. (I think).
I am trying to remember why so much (it wasnt about money or him being a sales guy) data, but i'm sure it was correct.
Can anyone enlighten me? I know its kind of vague and I cant contact the guy any more.
Thanks if you can help