If the data in your scanner (current cdat & v-scanners) is newer than what you have in EZ Scan, then you will need to copy the configuration from the radio to EZ Scan. If the data in EZ Scan is newer, then you can replace your card without copying the configuration.
When you are ready to replace the card, insert the card in your pc (recommended due to speed) or into the radio.
Go to EZ Scan, click on Scanner/SD Card tab
Select Prepare Scanner Memory/SD Card for use
Follow the directions to prepare the card
Copy the configuration from EZ Scan to the radio and you're all set.
in addition to making a new card, I like to create a 2nd card for backup, in case your primary card goes bad.