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This article applies to version 6.

Other available versions:

Version 4icon.qnmark.png

Available in:

Small Business
Code42 Support

Use the Code42 app with limited bandwidth

This article applies to version 6.

Other available versions:

Version 4icon.qnmark.png

Available in:

Small Business


The Code42 app is designed to make minimal demands on your computer's resources, and favors quiet background operation over outright speed. There may be times that you need to reduce the bandwidth you allow the Code42 app to use, such as:

  • If you have limited bandwidth or a bandwidth cap.
  • If you are using voice over IP (VoIP).
  • If the Code42 app backup activity is competing with other network applications, and you would prefer to allocate more bandwidth to those applications.

This article outlines some adjustments that allow the Code42 app to use less bandwidth, as well as some items to consider before changing any settings.


  • By adjusting the settings described below, the Code42 app will use less bandwidth, but it also slows down your backup.
  • Results of changing settings may not be immediately apparent. You may need to wait a short time before noticing improvements.
  • You can return to the default bandwidth settings at any time.
Backing up locally and online
We recommend configuring the Code42 app to back up to more than one destination. Usually, one destination is local, such as an external hard drive, and one destination is off-site, such as on the Code42 cloud. Backing up to a local drive is generally faster and ensures that your files are safely backed up even as your offsite backup is in process.

Before you begin

Review your file selection to ensure that you have only selected files that you need to back up. Backing up system files or application data can dramatically increase your bandwidth usage.


By default, the Code42 app has limits in place to prevent it from using too many system resources. If you have limited bandwidth, a bandwidth cap, or utilize VoIP, there are several settings you can adjust in the Code42 app to reduce the impact of the Code42 app on your bandwidth. Changing these settings reduces the system resources available to the Code42 app, but extends the amount of time required to backup your files

Changing settings
Try the options below in the order presented. If you see enough reduction in speed after one or two changes, avoid making more changes.

Schedule backup

If there are certain times of day during which you want to reduce the Code42 app's bandwidth usage, you can schedule specific days and times that you want the Code42 app to back up. For example, you may want to schedule backups to occur overnight, when you aren't using the Internet.

To change your backup schedule:

  1. Open the Code42 app. 
  2. Navigate to backup set settings:
  • Code42 app version 6.8.3 and later:
    1. Select Settings gear icon.
    2. Select Backup Sets.
  • Code42 app version 6.8.2 and earlier:
    1. Select Details.
    2. Select the action menu.
  1. Next to Backup Schedule, click Change
    Note: Your administrator may prevent editing the backup schedule settings. 
  2. Select Only run between specified times and set a start and end time for your backup window. 
  3. Click Save.
    Backup Schedule settings

Change bandwidth settings

To reduce the amount of network bandwidth the Code42 app uses, you can lower the rate at which files are sent from the Code42 app to the backup destination.

To change the sending rate in network settings:

  1. Open the Code42 app.
  2. Navigate to Device Preferences:
  • Code42 app version 6.8.3 and later: Select settings button Settings.
  • Code42 app version 6.8.2 and earlier: 
    1. Click Details.
    2. Select the arrow next to your device name.
    3. Choose Device preferences.
      device preferences
  1. Select Network.
    Network preferences
  2. In Bandwidth Settings, click Change for WAN or LAN. WAN is for sending data over the Internet and LAN is for sending data over your computer's local network.
  3. For both WAN and LAN, change Limit sending rate when away to or Limit sending rate when present to as needed. (On Linux, you can only change Limit sending rate to.) Start by setting the limits to 100 kbps.
  4. Click Save.
    Bandwidth settings for WAN
Minimum recommended sending Limits
When setting network sending limits, do not set a rate lower than 0.10 Mbps or 100 Kbps. Rates lower than 0.10 Mbps can prevent devices from communicating with the Code42 server, which can stop backups. To stop backup entirely, do not adjust sending limits. Instead, you can pause backup or only allow backups at specified times.