Which is a good backup utility to use? Especially for disk image cloning. All these mentioned are currently taking +-3 hours to clone the 500gb drive and doing a recovery takes nearly 5 hours. i've used Acronis, Norton Ghost , DriveImage Xml, Macrium Reflect.
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Actually I would recomend you to use iSCSI for backup. I think you have some network, and iSCSI will perfectly utilize it. Try some free solutions - Openfiler or StarWind Trial for this.