Up until just a few months ago, it was cheaper to just buy some random cheap disk and back up to it. VTLs were more expensive for two reasons: the existence of de-dupe and the fact that some software vendors are now charging you to back up to regular disk.
I was just talking to a customer the other day who believes that VTLs cost too much and they're not worth the extra cost. It got me to thinking: is that really true anymore? The answer's no.
Here's the facts:
|ATA Disk Array||De-duped
disk or VTL
|Per/TB hardware cost||$3-8K||$1K||Best attempt at street prices of low end disk.
All de-dupe vendors are coming out at about $1/GB
|Per/TB backup s/w license||$0-1K||$0-1K||
Disk: Legato $1K/TB, Symantec $0 (for now), TSM $0
|Total cost per TB||$3-9K||$1-2K|
Please stop telling me that VTLs are more expensive than regular disk. I return you to your regularly scheduled web page.