I back up our business working files pretty much as MossRoad described above...and more than once I have found one of the DVDs or CDs (I've been doing this since before DVD burners) wouldn't read. The two copies get kept apart....one in the house (home office), the other in an undisclosed secure location that is not the house.
Unless I screw up, forget, or get distracted, I usually have discs current to one or two weeks, and current to real time on some remote drives. I think my external WD drive uses a firewire connection rather than USB, which I believe is faster.
Years ago I lost a HD with important business information. I paid dearly to a data recovery place who recovered only part of it. After that I went to at least two drives and double discs. PIA? Sometimes. But when the master disc with my son's wedding pictures decided to barf, guess who was able to pull them out of backup? (I imagine the photographer would have had them too, but you get the point) I now backup on two networked PCs as well, replicating data on 3 HDs with different controllers. I assumed my external HD was using the same controller as the internal HDs on that PC, but if I read MossRoad's post correctly, it is a separate controller too.
Years ago I lost a HD with important business information. I paid dearly to a data recovery place who recovered only part of it. After that I went to at least two drives and double discs. PIA? Sometimes. But when the master disc with my son's wedding pictures decided to barf, guess who was able to pull them out of backup? (I imagine the photographer would have had them too, but you get the point) I now backup on two networked PCs as well, replicating data on 3 HDs with different controllers. I assumed my external HD was using the same controller as the internal HDs on that PC, but if I read MossRoad's post correctly, it is a separate controller too.