I am creating my own backup server to backup my 3 webservers at a host. What is the best OS to choose for this server? If my webservers are Linux and I am using rsync to backup the data. Would a version of windows or windows server work?

Thanks for any help

PS thx for not letting me edit my title. It should say OS not I'd.

Use the same OS for all to avoid any case sensitivity issues

With Windows ThisFile.ext is exactly the same as thisfile.ext, with *nix they are different files.