help resetting and resetting up NAS RAID

[Enquiries]

Hi! I have a QNAP TS-451+ NAS with four 8TB disks. The person that set it up was not very helpful. They set up Apple Time Machine to keep taking space forever and I don't want that. I have copied all of the actual data (not Time Machine) onto a separate external drive and either want to wipe the Time Machine data so I have space again (if I need to wipe it completely and start over that's OK). Then I want to set up a back up of my laptop as well as redundancies for the actual data on the NAS.

Please help! I know this is a powerful device and I hope if someone helps me set it up correctly I can use it to its full power.

Thanks!