Muckelroy said:
Until recently, tape drives were commonly used as backup at the Firestation Studios. The only 2 downsides to the format itself are: 1- it takes TIME to write/read data, and 2- there is no real-time data verification. So if an error occurs while writing data, you never know it happened until you go back and try to recall the file. But, of course, if your drive is in good shape, and you use tapes properly, that shouldn't be a huge big deal. Pretty reliable format for storage purposes, so I've heard.
You should always use both data verification and periodic test restores with any backup medium. What we always do with server installs is use both RAID and tape backup, and for critical data we may even copy to another physical disk periodically. For my own audio data I have copies on my home PC, work laptop, removable hard drive and the server at work.
In other words, for critical data:
* Have an offsite backup, tape is robust and cost effective.
* Use a redundant system such as RAID1 or RAID5.
* Make copies before modifying stuff.
* Copy to another physical media.
Different forms of tape also have advantages and disadvantages. DDS DAT (the latest is DDS5 or DAT72) is cheap and reasonably reliable, but a bit slow. LTO is faster and more reliable, but a bit more expensive. It has higher capacity though so we're doing more and more HP Ultrium LTO drives these days. DLT was regarded as rock-solid, but tapes are expensive and we don't see as much. Travan? Just say no!
Muckelroy said:
I remember seeing somebody backing up their Pro-Tools session on a HP data tape downstairs, and once it finished backing up (a few hours later,) He tested the data, and tested if he could open each file, and play it back successfully from the data tape. About 4 hours later, I came back, and he was re-writing the tape, because he had found an error in his snare track. 2 hours later, he re-verified, and it was fine. But the whole ordeal took all damn day. At least he can rest assured that it's backed up for years to come.
For archival I'd take at least two copies, and also consider putting it on a different medium - hard drives are cheap, so it doesn't hurt to put a copy on there as well. That way you can have multiple disasters and still keep stuff.
...and of course if that data is audio, you also have your 2" 24 track master
