> I never used Classic Server. I read some articles about the differences between Classic Server and Super Server and, before trying Classic Server, I have some doubts:
>
> 1. The only thing I have to do is to deinstall FB 2.1 SS and install FB 2.1 CS on the server and everything will work?

Yes. But don't forget to check configured data page cache at server
level as well as at database level. Default 72 pages may be too small.
Depending on page size and available RAM you can try something between
256 and 1024 for the beginning.

> 2. Do I have to do something in client PCs?

No.

> 3. There is a user who everyday makes a backup from his client PC using gbak and saving the backup file (.FBK) in his local disk. This will continue working?

Yes.

SY, SD.