an external USB or Firewire drive is good for backup, but slower than an internal drive.
I have tried
-external USB drive
-external Firewire drive
-external SATA drive
-internal fixed parallel drives
-internal but pluggable parallel drive
I have not yet tried RAID or network storage.
In my next computer I will use only SATA drives, and have at least one pluggable. I will probably investigate RAID for redundancy, but not as a way of securing long term storage and backup.
I am using regularly several external USB drives for backup of pictures, and find these very convenient. But these external drives are a bit slower than internal drives.
I installed a pluggable hard drive, and it is definitely faster and acts exactly as an internal drive. I can (after powering down) unplug the drive from the front panel of the computer and insert another drive into the same space. This makes it very easy to keep several backups, one always stored away from the room where the computer is located.
I do not trust CD and DVD as backup. You need to make several copies to make sure you have a usable backup when you need it. Using several hard drives is faster and in my opinion more reliable.
Backup is very important. I once lost the content of three hard drives at once, in the same computer (that was all my data at that time!).
An on one airline flight, two hard drives that I had in my checked luggage were completely destroyed. And I have had several hard drives go bad from old age. I find that hard drives can be expected to last no more than about three years.
Tage
I am planning to get a new computer in the new year. I wanted to
get a second HD for photos & video. Is it better to get a second
internal HD or is an external (USB 2 & Firewire) drive just as good?
Thank you for any replies.