I want to know do you know do you need to stop the daemons manager before performing
NMSROOT\bin\perl dir1\wrapper.pl BKP
it doesn't says you don't according to the data migration documentation but it states you need to when performing the restore. Please let me know if I need to so I can determine on why i'm receiving errors toward the end of the backup.
No, you don't need to shutdown dmgtd before running the backup (only before running the restore). Looks like the permissions on the current files in your backup location are too restrictive. Try manually deleting all contents of E:\BKP, then run the backup again.