kotesh - 2013-12-19

I got files with filename.xxxx.sql.gz and few files with filename.xxxx.diff.gz . when I tried to extract it shows
$ gunzip daily_kotesh_2013-12-09_01h30m_Monday_RDmV79ik.sql.gz
gzip: daily_kotesh_2013-12-09_01h30m_Monday_RDmV79ik.sql.gz has 1 other link -- unchanged

how can I restore the db using the base and incremental backups ?