Unanswered: help-ntbackup change the date of the "last database backup" on sqlserver2005
I have a machine with S.O.=W2003R2Server/SP2 and SqlServer2005/SP3.
If I run a backup for some files with ntbackup on this machine(wich not include any sqlserver files-for example some *.txt files, system state backup,...), the date of 'last database backup' for all databases was changed. In Sqlserver logs(SSMS-SqlServer Agent-Error logs-View agent log), appear new records about backup, like: I/O frozen, I/O resume, Backup full database....
This is not a SqlServer backup and no file like *.bak was made(only *.bkf, with ntbackup) .
For SqlServer backups, i run schedule jobs with SSMS/SqlServer agent (full & differential backup).
The ntbackup operation may break the differential backup chain of sql server 2005 because the date of "last database backup"(from database properties) was changed with the date/time of ntbackup operation. How can I resolve this issue?