Sharing some quick thoughts on QNAP's TimeMachine experience...
1) It's really fast compared to a TimeCapsule, not quite as fast as a local drive
2) Not quite as fast perhaps - on a TS-453Pro compared to a MacMini running OS X Server with an attached USB3/FW800/Thunderbolt drive
3) With 5 clients backing up to the QNAP - after a month or so, all the sparse bundles end up corrupted, and El Cap's TimeMachine Client states that the backup has various issues, and gives up - starting a new...
QNAP - TimeMachine and QTS experience
1) It's really fast compared to a TimeCapsule, not quite as fast as a local drive
2) Not quite as fast perhaps - on a TS-453Pro compared to a MacMini running OS X Server with an attached USB3/FW800/Thunderbolt drive
3) With 5 clients backing up to the QNAP - after a month or so, all the sparse bundles end up corrupted, and El Cap's TimeMachine Client states that the backup has various issues, and gives up - starting a new...
QNAP - TimeMachine and QTS experience