More than half of British companies now prefer disk-based backup over tape, and in the financial services industry the margin is even greater, with almost two-thirds opting for spinning storage, according to a survey commissioned by RAID developer Infortrend. The big drivers for disk-based backup are the shortening of the …
It's not all that it's cracked up to be...
If you're using Disc-Disc-Tape backups, your staging disc area needs to be FAST. I've found (the hard way) that disc systems aren't anywhere near as fast as they claim to be.
If you're doing snapshots, then backing up the snapshots to tape, you'll be hammering the live discs (and hurting performance) whilst you backup the snapshot.
On-site verses off site
Most tape backup operations require the cycling of the tapes off site in case there is a disaster. The biggest problems for backups is the OS and how fast it can supply and take the data. Snapshot images of the disks get around some of these limitations but often will only restore to the system from which they were taken. True backups will restore to a different system which is all you'll have after a fire or flood. I'm not saying disk backups are bad, they just have different limitations. A good archival system would have both, disk for near-line and tape for off-line (off site) backup.
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