Re: What happens to Time Machine?
@ JaimieV "You can point multiple Macs at one destination TM target. Each Mac creates its own sparsebundle to backup into. They cope with the inevitable running out of space okay."
I agree on the first point as I have three MacBooks (Pro/Pro/Air) pointing at a single Time Machine target on an old Netgear ReadyNAS Duo (v1 Sparc) and they all coexist happily. The only thing I'd disagree on is the running out of space gracefully. It's fine if they back up one at a time as if the space gets low they clear up their own Sparsebundle accordingly. If more than one is backing up at the same time and the space runs out they deal with it by throwing all their toys out the pram and dumping their entire Sparsebundle as corrupt taking the full backup history with it.
Apart from this aspect I've found Time Machine on 3rd party NAS very reliable.