Quick Update: Faster, More Frequent Mac Backups

One of the big reasons people don't back up more often? Backups
take too long. On a disk that's filled with data, even a routine
backup can drag on — not because much changed, but because CCC has
to stop and check every file and folder just to find out. CCC's
Quick Update feature cuts straight to the chase:
it asks macOS which folders actually changed and skips everything
else. Faster backups mean you can comfortably back up more often,
which means your backups are more likely to be fresh when you need
them.

How does Quick Update
work?

macOS has a handy service that tracks filesystem activity on
your local drives. When a backup task runs, CCC can ask this
"FSEvents" service for a list of folders that contain files that
have been modified since the last time the backup task ran. CCC
then limits its comparison activity to only that smaller collection
of folders, rather than performing an exhaustive enumeration of
every file and folder on the source and destination.

Why is Quick Update so much
faster?

When you're dealing with slower storage like most backup disks,
it might take a...