Currently, we control incremental backups behavior from the storage service.
This creates some very concrete problems, since the storage service is not
always available and initialized.
The solution is to move it to the column family (and to the keyspace so we can
properly propagate the conf file value). When we change this from the api, we will
have to iterate over all of them, changing the value accordingly.
Signed-off-by: Glauber Costa <glommer@scylladb.com>
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