[kwlug-disc] question about use of rsync --checksum flag

[Mikalai Birukou]

I always hear "Do you test your backups?" reminder.

zpool(s) scrub themselves. It feels like testing, at least on a storage 
layer.

But what about those rsync powered places without zpool? Is checksum-ing 
useful? Are there any strategies?

Or, if both source and destination are not zfs-level reliable, does 
checksum-ing make sense if it can introduce errors into backups?