GFS (grandfather, father, son)
Atape rotation backup strategy ofmaintaining backups on a daily,weekly, and monthly schedule.Backups are made on a 5-day or 7-day schedule. A full backup is performedat least once a week. On allother days, full, incremental, or differentialbackups (or no backups atall) are performed. The daily incremental,or differential, backups areknown as the son. The father is thelast full backup in the week (theweekly backup). The grandfather isthe last full backup of the month(the monthly backup).