GFS backup schemeThis section covers implementation of the Grandfather-Father-Son (GFS) backup scheme in Acronis Backup & Recovery 10. With this backup scheme you are not allowed to back up more often than once a day. The scheme enables you to mark out the daily, weekly and monthly cycles in your daily backup schedule and set the retention periods for the daily, monthly and weekly backups. The daily backups are referred to as “sons”; weekly backups are referred to as “fathers”; the longest lived monthly backups are called “grandfathers”. GFS as a tape rotation scheme GFS was initially created and is often referred to as a tape rotation scheme. Tape rotation schemes, as such, do not provide automation. They just determine:
Tape rotation schemes enable you to get by with the minimal number of cartridges and not to be buried in used tapes. A lot of Internet sources describe varieties of the GFS tape rotation scheme. You are free to use any of the varieties when backing up to a locally attached tape device. GFS by Acronis With Acronis Backup & Recovery 10, you can easily set up a backup plan that will regularly back up data and clean up the resulting archive according to the GFS scheme. Create the backup plan as usual. For the backup destination, choose any storage device where automatic cleanup can be performed, such as an HDD-based storage device or robotic tape library. (Since the space freed on the tape after cleanup cannot be reused until all the tape becomes free, take into account additional considerations when using GFS on a tape library.) The following is an explanation of the settings that are specific for the GFS backup scheme. GFS-related settings of the backup plan Start backup at: Back up on: This step creates the total backup schedule, that is, defines all the days you need to back up on. Assume you select backing up at 8:00 PM on workdays. Here is the total schedule you have defined. “B” stands for “backup”.
Weekly/Monthly This step forms the daily, weekly and monthly cycles in the schedule. Select a day of the week from the days selected in the previous step. Each 1st, 2nd and 3rd backup created on this day of the week will be considered as a weekly backup. Each 4th backup created on this day of the week will be considered as a monthly backup. Backups created on the other days will be considered as daily backups. Assume you select Friday for Weekly/Monthly backup. Here is the total schedule marked out according to the selection. “D” stands for the backup that is considered Daily. “W” stands for the backup that is considered Weekly. “M” stands for the backup that is considered Monthly.
Acronis uses incremental and differential backups that help save storage space and optimize the cleanup so that consolidation is not needed. In terms of backup methods, weekly backup is differential (Dif), monthly backup is full (F) and daily backup is incremental (I). The first backup is always full. The Weekly/Monthly parameter splits the total schedule into daily, weekly and monthly schedules. Assume you select Friday for Weekly/Monthly backup. Here is the real schedule of the backup tasks that will be created.
Keep backups: Daily This step defines the retention rule for daily backups. The cleanup task will run after each daily backup and delete all daily backups that are older than you specify. Keep backups: Weekly This step defines the retention rule for weekly backups. The cleanup task will run after each weekly backup and delete all weekly backups that are older than you specify. The weekly backups’ retention period cannot be less than the daily backups’ retention period. It is usually set several times longer. Keep backups: Monthly This step defines the retention rule for monthly backups. The cleanup task will run after each monthly backup and delete all monthly backups that are older than you specify. The monthly backups’ retention period cannot be less than the weekly backups’ retention period. It is usually set several times longer. You have the option to keep the monthly backups indefinitely. The resulting archive: ideal Assume you select to keep daily backups for 7 days, weekly backups for 2 weeks and monthly backups for 6 months. Here is how your archive would appear after the backup plan is launched if all the backups were full and so could be deleted as soon as the scheme requires. The left column shows days of the week. For each day of the week, the content of the archive after the regular backup and the subsequent cleanup is shown. “D” stands for the backup that is considered Daily. “W” stands for the backup that is considered Weekly. “M” stands for the backup that is considered Monthly.
Starting from the third week, weekly backups will be regularly deleted. After 6 months, monthly backups will start to be deleted. The diagram for weekly and monthly backups will look similar to the week-based timescale. The resulting archive: real In reality, the archive content will somewhat differ from the ideal scheme. When using the incremental and differential backup methods, you cannot delete a backup as soon as the scheme requires if later backups are based on this backup. Regular consolidation is unacceptable because it takes too much system resources. The program has to wait until the scheme requires the deletion of all the dependent backups and then deletes the entire chain. Here is how the first month of your backup plan will appear in real life. “F” stands for full backup. “Dif” stands for differential backup. “I GFS backup scheme |
