LD 74.5: Backup best practices

different from syncing, keep historical versions
Grandfather-father-son rotation
more than 1 physical location (1 local and 1 cloud)
practice restoring from backup
check that backup media is working
The Tao of Backup
good to have: deduplication, encryption, compression
use 2 independent backup software (mitigate software bugs)
store a copy of the backup software along the backup (mitigate software disappearing)