I would add data integrity to the list, in addition to redundancy and backups. ZFS is great in this regard: redundancy, data scrubbing to ensure data integrity

I would add data integrity to the list, in addition to redundancy and backups. ZFS is great in this regard: redundancy, data scrubbing to ensure data integrity and built-in snapshotting and data replication features (zfs send-receive). Can't believe how I got by without ZFS in my earlier years of data hoarding.