Hello, I am looking for the best solutions for networking / backing up.... I am currently using macOS Server on a late 2009 27" iMac with i5 processor, 24Gb memory and a new 3Tb WD Black HD. I have a 3Tb external drive attached for Time machine backups. I access this machine with two other iMacs... Basically all files are on the 09 system. The two other iMacs are loaded with Apps only. All other files are stored on the "server". I am considering switching over to either a DAS or NAS system. I'm looking at Drobo 5n or 5Dt with WD Red drives. 1st.. The solution I am using now works fine, so perhaps I should just leave well enough along and stick with that. 2nd.. If I do change I am leaning towards the NAS 5n. My real concern is the 2009 iMac, it's getting long in the tooth, but still works fine for what I am using it for. Thoughts?