Backing up your wallets is a fairly easy process. By pressing the Export Accounts button, it will ask you where you want to save it.
Choose a safe location to save it, and your done!
Locate the Keystore folder and copy the files to a secure location.
By default this will be located in
Importing up your wallets is just as easy. By pressing the Import Accounts button, it will ask you where your backup is.
Navigate to your backup file, select it, and press open.
And thats it. Your backup is now imported!