Same recommendation here. I went through two QNAP units before being fed up and building my own 12 Bay for about 1200. My first QNAP died shortly after the 3 year warranty expired and the second died shortly before. I was able to RMA the second and sell it to recoup some money towards building my own TrueNAS system that I can now fix myself and not rely on proprietary anything.
What type of disk (HDD or SSD) and how many disks in the pool?
RAIDZ1 configuration will bring your write speed down some due to data having to write to multiple disks at a time. This is true for most any RAID. Once written, your read speeds should remain the same or improve a bit though.
Not sure if you’ve de-googled yourself or not but there is a Google Drive Addon that has a whole slew of options for backing up your HA config. I’m sure there are alternate HA add-ons. This may require HACS but not certain.
This is the one I went with along with a supermicro server board. The company has been great as I’ve already needed replacement rack screws and a new control board due to my own foolishness. They shipped me replacements at no charge very promptly.
https://a.co/d/a1kZQYX