Is it possible to recover RAIDs?

You can try to recover RAIDs in Disk Drill. RAID recovery is supported to the extent of scanning individual RAID disks and recovering data on each of them. Disk Drill doesn’t support reconstructing RAIDs themselves. This is something not possible in an automated self-serve case. Basically, Disk Drill recovers individual disks rather than RAIDs, and you can definitely run a deep scan of each disk in the array.

Note that you have a higher chance of RAID 1 recovery (with “mirroring”) than RAID 0 (with “striping”), because the capacity of a RAID 0 volume is the sum of the capacities of the disks in the set and thus any failure of one disk causes the loss of the entire RAID 0, while in RAID 1 data is written identically to each drive in the set.

Note also that if your RAID is configured as a concatenated disk set (also called “Just a Bunch of Disks” (JBOD) or “spanning”) in Disk Utility, chances to recover data from it will be much higher.