Disabling drop table recovery won't resolve the error related to backup, backup operation needs to update the history file. As Sathyaram said, check the db2diag.log to understand why you're getting this error.

What you may try to do is to rename your existing history files (db2rhist.asc and db2rhist.bak) located under the db directory of this db. DB2 will recreate them when it needs to write to the history file.