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This article applies to Code42 for Enterprise version 4.

Code42 Support

Back up very large files

This article applies to Code42 for Enterprise version 4.


CrashPlan does not limit the size or types of files you can back up. However, if you are backing up one or more very large files, you may need to adjust your backup settings. This article describes optimal settings for backing up very large files.


If your backup frequently doesn’t reach 100% complete, it may be due to a large file that doesn’t have enough time to back up.

To see details about what isn’t backing up:

  1. Open the CrashPlan app
  2. From Backup > Destinations, click the more info icon More info
  3. Note the number and size of files in CrashPlan’s To do list
  4. If CrashPlan isn’t currently backing up, click the Back up now icon Back up now
  5. After backup completes, review the To do list again

If the number and size of files in CrashPlan’s To do list remains relatively unchanged after a backup runs, it’s possible that CrashPlan’s settings need to be adjusted to handle the size of one or more files, or the remaining files are open or in use.

Recommended solutions

Adjusting the following settings within the CrashPlan app allows larger files to back up more regularly.

CPU settings

Increasing the CPU resources available to CrashPlan allows it to analyze, compress, encrypt, and back up large files more quickly.

To increase the percentage of CPU resources available to CrashPlan:

  1. Open the CrashPlan app.
  2. Select Settings > General.
  3. Increase the percent CPU CrashPlan is allowed to use when the user is away to 90% and when present to 60% or more. You can always scale back if CrashPlan interferes with your work.
    In Linux, CrashPlan will always use the "Away" setting.
  4. Click Save.CPU Settings

Schedule backup

If CrashPlan is set to back up only between specified times and doesn't finish backing up a large file before the scheduled end time, CrashPlan stops backing up the file. Backup resumes the next time CrashPlan is specified to run.

To allow more time for the large files to back up, set the backup to always run:

  1. Open the CrashPlan app
  2. Select Settings > Backup
  3. Change the Backup will run time to Always
  4. Click Save

Delay the file verification scan

The file verification scan is a secondary check for new or modified files. By default, this scan runs once per day. This scan will interrupt back up of a large file if that file is backing up when the scan begins.

To delay the file verification scan:

  1. Open the CrashPlan app
  2. Select Settings > Backup
  3. Change the Verify selection time
    Running every 3 to 7 days is recommended
  4. Click Save

Adjust frequency settings

CrashPlan's default backup frequency setting backs up new and changed files every 15 minutes, allowing you to easily revert to a previous version of a file. However, backing up these changed files may interrupt the backup of a large file when there are newer and smaller files to be backed up.

Extending the default backup frequency allows CrashPlan to work through your large files without the the additional workload of backing up multiple versions of the smaller files. The trade off to extending the backup frequency time is that your new files and changes won't be backed up as quickly.

To increase the time between backups:

  1. Open the CrashPlan app
  2. Select Settings > Backup > Frequency and versions > Configure
  3. Change the New version interval to a longer period, such as every day.
  4. Click Ok
  5. On the Settings > Backup tab, click Save

Backup Frequency Settings

Change default sleep settings

When your computer goes into sleep mode, all network activity is disabled and CrashPlan can't back up files. In order to back up your large files, disable your computer's default sleep settings.