Backup size is lower than source, is it normal?

My backup repository is lower than the size of my source repository (around -25%), even after 26 versions. Is it normal ?
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There is a compression process when we run a backup ?

Features in the manual describe the main size reducers.

Compression

Deduplication

Incremental backups

“Normal” depends on your data. It’s certainly not unheard of to be smaller.
Mine is a little bit smaller, but I know I’ve got some duplicated files around.

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