tar problem with share under Windows

[pla70]

I have mount a network share in this way

mount -t smbfs -o username=xxxx,password=xxxx,workgroup=xxxx,ro //host/share /mnt/share

and there no problem but when i try to tar this partition or a part of it with

tar cpvf /data/backup/backup.tar -T /root/listbk

i got sometimes the following message error
FILE CHANGED AS WE READ IT
while i am sure that noboy is using these files and as you see i have mounted the share in read-only so .. and after some of this messages the tar give a final exit error and stop the tasks .. looks like that is allright .. it have done the backup but what means that message? Do I need care about it or what?

Thanks for everyone can help me
G.Pietro

p.s. Excuse me for my english

 

[jaymzter]

I am not sure, but I think to back up from a samba share you use smbtar. I have never used this, but the man page is fairly clear. Also, the o'reilly samba book is available on the web, chapter 8 covers backups using smbtar.