PRIV1.EDB date not changing

Hi,

Have windows 2000 server service pack 4 with Exchange Server 2000 with service pack 3. Noticed that the date/time stamp on the priv1.edb is not changing. The logs seem to be changing day to day. The concern I have is that the backup file that is done with Microsoft Backup is not changing in size although the date/time for that file is updating. Is this normal? When I do a restart on the exchange services, the priv1 database does update the date/time. But how is this affecting the backup?

Thanks for any help you can provide,

Jim