I would like to upgrade Charon, and then use the old Charon as the new Poly. This would allow me to retire the old Poly which is starting to show its age.
The new Charon should be a small-ish PC (physical size) so that it can hide under the desk neatly. The current model has a 10G drive. This should probably be closer to 30G in order to be able to back up stuff onto the server from our personal PCs. Or we could go with a 9G drive and add a second 30G drive for backup/extra storage in order to be more flexible later.
Built-in support for SCSI would be nice, but not required. I will probably continue to use the DLT tape drive to back everything up, but I can use the existing PCI/SCSI Adaptec card for this.
I have thought about making Charon be the firewall for the windows machines. I may or may not do this, but I should get a second ethernet adapter in any case.
On installing the new Charon, I will move the tape drive from Poly to the new machine, and Charon will become the backup server. At some later time I will reinstall the old Charon as the new Poly and retire the old Poly.