Backup Manager hangs and cannot be opened. It creates processes which consume cpu.
When you open Backup Manager, it reads information about existing tasks from these directories :
The process stuck if there are corrupted records.
Clean the directories:
~# rm -rf /usr/local/psa/PMM/rsessions/*
~# rm -rf /usr/local/psa/PMM/sessions/*
~# rm -rf /usr/local/psa/PMM/tasks/*
Note: the directories contain logs files for previous backup/restoration tasks.