If you think CrashPlan is using too much bandwidth you are able to restrict its availability. Each of your device's settings includes the option to set a schedule of allocated bandwidth, which can be found under the network tab in the web console.
The web console can also specify different data transfer rates for peak and off-peak business hours by setting scheduled sending limits.

You can access the web console and device backup settings, which contains your network settings, by following this guide: https://help.ceejay.com/crashplan-endpoint-protection/admin-console-help-guides/web-console-guide-for-users

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