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If you are using version 3.7 paid version, simply follow the following steps to upgrade to version 4.
Open your current version 3.7 CloudBacko backup software. The software will prompt you about the availability of new version 4. Click [Details].
If your version 3.7 doesn't show the above screen, go to Settings > Software Update and click [Check update].
Wait until you see the new CloudBacko software frontpage. Your CloudBacko has been upgraded successfully.
Click [Backup Sets] and you should be able to see all your backup sets being retained.
If you have trouble during upgrade, please contact our support.