When one Picture Keeper becomes full, just purchase another one (any size) and Picture Keeper will only copy the remaining pictures. For example, if you've purchased a PK 4 (or Starter) and it's full, but you have 1543 pictures still remaining to be copied, you may purchase a PK 8 and it will copy the 1543 remaining pictures. You'll also have space to add more photos when you use the Picture Keeper in the future.
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Once you have your second Picture Keeper, simply insert it into your computer, open the software and click the Start Backup button. When the Resume Backup pop-up appears, click "Yes" to continue where your last drive left off.
How does it know where it left off?
See this Help article: Does a second Picture Keeper start where the first one stopped?
If you need any additional assistance, please contact Picture Keeper Support.