Unfortunately, I have no idea about Time Machine, the one Mac I have is running 10.4 (pre Time Machine).
SMB, SSH/SFTP (even set up key-based auth), regular FTP all work great. Transmission works great and has a decent web interface. UPS support seems to be okay, haven't really tested it.
DLNA/UPnP (fuppes) crashes all the time and I only tried it with the very buggy VLC for iOS, so I'm not sure how stable it actually is.
SMB, SSH/SFTP (even set up key-based auth), regular FTP all work great. Transmission works great and has a decent web interface. UPS support seems to be okay, haven't really tested it.
DLNA/UPnP (fuppes) crashes all the time and I only tried it with the very buggy VLC for iOS, so I'm not sure how stable it actually is.