Hi,
In conjunction with what Tore said, I have a couple of questions:-
1. What is the backup software.
2. Is the backup software compatible with WIN2008, as 2008 didn't exist 10 years ago.
3. Some backup softwares do a virus scan in conjuction with the backup, if so what is the scanner.
4. What virus scanner is being used. Is the app data directory excluded from the realtime scan.
5. Is Oplocking disabled.
6. Is disk write caching disabled.

>At one of our clients it happens regularly that the index of one table gets corrupted over night.
>
>I suspect the backup procedure which backsup open files, but they say they are using the backup for 10 years already, so why does it start happening now?
>
>Has anybody seen this happening, and what other reasons could there be?