A snapshot is a read-only copy of the disk contents which stores just the differences in the data between the original and the snapshot. Snapshots are useful for making incremental backups and quickly reverting to a previous version of the disk data.
A backup is a full copy of the disk contents which stores all the data from the last backup. Backups are useful for storing a complete version of the disk's data so that the data can be restored should something unexpected happen.
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