What file system does QNAP use?
QNAP devices usually use the EXT4 file system. However, ZFS file system is becoming increasingly common in QNAP devices of enterprise level.
There is a good chance that QNAP manufacturers will move all their devices to ZFS in the future, as it works better with large amounts of data.
In terms of data recovery, there are quite a few solutions for those devices that run ext4.
For ZFS devices, at the moment (2023) there are practically no algorithms for data recovery.
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