Seafile data model: will objects ever change on storage?

As Seafile’s data model is similiar to GIT’s, object IDs seem to be based on the hash value of the object content, for commits, fs and blocks alike.

However, is there any possibility that seafile will change an object’s content after creation? For backup purposes, it would be much more efficient to rely only on object IDs instead of stating every single object on storage.

The objects are not changed after creation.