ZFS is very robust, especially in a mirrored setup. Compared to your sync setup, with ZFS you could have snapshots, which would let you rewind back to earlier v

ZFS is very robust, especially in a mirrored setup. Compared to your sync setup, with ZFS you could have snapshots, which would let you rewind back to earlier versions of files. This is a good mitigation for ransom ware attacks. You also get bit-rot protection, where you know what you read is what you wrote. Without this protection, if a file gets corrupted on your primary drive, this corrupted file will get synced to your backup drive. ZFS helps with both of these and a mirrored setup would give you a boost for read IO speeds. Of the many ways storage can get complex, I've found ZFS to be one of the most straightforward.