Anything that allows you to make backup copies will take up space… the same amount of space as the file you are backing up. So if you have a 1 Meg file and you are taking a shadow copy of it 5 times a day you will use 1 Meg in the file and 5 megs for teh backups— for as many days as you setup to keep the backups.

Not a big deal, but sometimes people forget that or turn it on for the whole drive and don’t realize it too takes up space on the drive.