You're probably okay. A year or two ago I scanned in a lot of old family photos at 2600 dpi or something - old black & whites. All of those take up massive amounts of space.
Then my camera is something like 16 megapixel and I shoot in raw. And I'm lazy about deleting my bad photos.
I have my photos on a RAID - basically, I have 2 1.5 terrabyte harddrives that the computer writes to in parallel... so whatever I put on that "drive" is copied to both drives. If one harddrive fails, I still have all my data/photos on the 2nd.
of course... the backup is right next to each other, it doesn't help if the house burns down.
Picasa also doesn't change the original file when you start modifying photos - so you can always get back to the original. Even if you tell it to save your changes, 'cause it'll keep a backup of the original.




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