Have run 1.4 ... earlier with no problems.
First updateing to 1.6. showed some errors due to permissions.
Couldn't remove all files after that from Plug-in menu.
Removed all manually via ftp.
Plug-in v. 1.6.0. installed without any error messages.
New scheduled backup job saved without any error messages.
No jobs are shown in job list.
However earlier backups are shown in backup-list.