Difference in files

[anoop401]

Hi all,
I run a script to take the back up of "mao-acc, hardware.old, hardware.mao, AA***.zip, AA***.swk, AA***.hw, ops.lis" files each week. For testing purpose I run this every day as of now. When I compare the files (md5sum) I see that "mao-acc, hardare.mao, hardware.old" files get changed every day. I am sure that no one is doing anything on these call servers. Is it normal them to be different ? Call servers are working fine anyway and we don't have any issues what so ever. I am only interested to know it is normal or not.
Any information is highly appreciated.
Thanks and regards.
ANOOP.

[vad]

mao-acc - database + accounting - realy changed.
hardware.* - just open file (this is just text file) - I think you will see string like "# OPS Update : Tue Mar 1 14:00:18 2005 " (time when OPS saved)).

[anoop401]

Thanks for the reply,
I see the changes sometimes, and sometimes its okay.
Regards.