After inputting the new server_idents.txt in the client (windows), the client can see both servers (linux) and do the backup. Can I backup different content of the client to the servers? Say one server for file backup, and the other image backup. Or one for drive C and another for drive D?
Yes, this should be possible.
Just specify on each server wether it should do image or file backups. In the server settings there are these options:
Do not do file backups
Do not do image backups