GFS Backup Calendar
| Sun | Mon | Tue | Wed | Thu | Fri | Sat |
|---|---|---|---|---|---|---|
| 1 | 2 | 3 | 4 | 5 | 6 | |
| Mon | Tue | Wed | Thu | Week1 | ||
| 7 | 8 | 9 | 10 | 11 | 12 | 13 |
| Mon | Tue | Wed | Thu | Week2 | ||
| 14 | 15 | 16 | 17 | 18 | 19 | 20 |
| Mon | Tue | Wed | Thu | Week3 | ||
| 21 | 22 | 23 | 24 | 25 | 26 | 27 |
| Mon | Tue | Wed | Thu | February | ||
| 28 | ||||||
The Grandfather-Father-Son (GFS) backup system allows an organisation to restore data from the previous day, week, month or year. A full GFS system uses 20 tapes for over the course of a year.
Daily tapes are used Monday-Thursday: these tapes are labelled Monday, Tuesday, etc., and each tape is used once per week.
Weekly tapes are used each Friday, with a different tape for each week of the month. These tapes are labelled Week1, Week2, etc., and are each used once per month.
Monthly tapes are used on the last Friday of the month, rather than a weekly tape. This tape is labelled with the name of the month. Many organisations also use a yearly tape at the end of each year.
