Yeah like 10 years ago

Depends what you want/need. You could just buy a 20TB disk (or two 10TB disks is probably cheaper). If you want redundancy, get (3) 10+ TB disks in a RAID5 array or raidz1 pool. If you want more redundancy, step up to RAID6 or raidz2.

I hate Comcast with a passion, but honestly their modem/router/gateway (and extenders) they gave me is better than anything I’ve had.

Comcast typically tests out about 20% over rated speed. I have the 1.2Gbps plan, but it tests around 1.5Gbps. Not sure if other ISPs are similar.

Don’t know if that would explain the router…I don’t know if every gigabit router has a hard limit.