Progress: Use reference to sync.Once
Progress: Use reference to sync.Once

jayme-github/restic,mappu/restic,stuertz/restic,fawick/restic,middelink/restic,kurin/restic,arithmetric/restic,ckemper67/restic,ar-jan/restic,byo/restic,byo/restic,restic/restic,kurin/restic,restic/restic,jayme-github/restic,stuertz/restic,middelink/restic,fawick/restic,ar-jan/restic