Optical Disks are coming along nicely, but are NO where near ready to replace tape.
Disk replication (off-site) is NOT cheap for an enterprise company. How big of a dedicated pipe does one need in order to replicate GBs of data? How much does it cost to keep a live copy of your data off-site? Tape storage is pretty cheap in comparison, I'd imagine.
What if the data isn't completely centralized?? We have servers with 100 GB of data (probably 5-10 GB incremental changes each day) at 8 different sites around the country. Our main office has 2 TB of data (100+ GB of incremental changes per day)
We do have a EMC SAN at the main site, with two mirrored copies, one of which we can take off-line and backup to tape. It's fast and easy andwe can do it during normal business hours... It's still a daily backup instead of a real-time vaulting solution... And we still use tape for long-term storage...
Tape holds a LOT... Tape can be taken off-site and stored for a fairly minimal cost.
DVDs hold what? 4.7 GB?? compared to 220 GB or more for SDLT tapes? Think I want to deal with 44 DVDs instead of one tape?
Blue-laser DVDs should hold about 27 GB, right?? Do these Blue-laser DVDs even really exist yet? That's still 10 DVDs for each tape. And somehow I doubt they cost only 0.50 each...
Who writes these articles?? Someone who actually works in the real world???
Gull