Too Many Open Files


Backup plan on MacOS fails with the following error: Error on processing some files

This error is also displayed in the History tab with the following message: Too many open files.


MacOS limits the maximum number of files a given process can open simultaneously. The error implies that the product is trying to exceed this limitation.


Reduce the max thread count to 5. To do this:

  1. Click the Settings icon, then switch to the Advanced tab.
  2. In the Max thread count field, enter 5.

  1. Click Close.