Nice test orion. Thank's for the time you spent on it

Results are what I was expecting for.
It would be nice to have a solution to save APP settings to volume2, a kind of "2nd level" of backup, the first one is the one provided on volume0...
With an AS5002T ( 2 slots ), you have still the possibility to create volume1 has raid, or to create 2 single volumes.
- raid is the recommended solution provided by asustor, and I think it's the good solution for people who buy a NAS. drawback is : raid is not a backup. data once removed are lost.
- 2 singles : once created a batch job to save critical data from volume1 to volume2, you have a solution to restore data once deleted ( just one day ). the "backup" disk should hibernate more often ( in fact : always, just wake up for backup )