Progress of mongodump operation jams at a random point
Seems that some other folks had this issue (here or here) without any clear resolution. Someone suggests adding --quiet to the mongodump command.

But maybe mongodump is not the correct way of doing it. From the documentation:


  mongodump and mongorestore are simple and efficient tools for backing
  up and restoring small MongoDB deployments, but are not ideal for
  capturing backups of larger systems


Also:


  When connected to a MongoDB instance, mongodump can adversely affect
  mongod performance. If your data is larger than system memory, the
  queries will push the working set out of memory, causing page faults


Some other methods of creating backups are detailed in the documentation. Maybe „Filesystem Snapshots” or „cp or rsync” are more suitable to your use case.