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I am really lost :/ I have checked the policy that comes with the program and copied it and try to change the different templates. And my second question is about media sets. Should I have three media sets? One for daily, one for weekly and one for monthly? I change backup tape every day.
Change your monthly backup to the 1st Friday of each month.
Weekly backups can occur on 2nd, 3rd, 4th, & last friday of each month.
'Should you have three media sets?' A general answer would be 'yes' for a GFS rotation. Keep in mind, rotation sets are really for defining how long you want to perserve the data. So ideally your Monthly backup media set has a very long overwrite protection period (months or years), your weekly media set OPP would be less (Weeks or months) and your daily set would be even less (days or weeks).
However, in your initial post you indicated you have 20 tapes, and you change tapes everyday. On average there are 20 weekdays in a month, so every month you would rotate through your entire set of tapes. -I'm not sure a GFS rotation is required for something like that. However, if you changed tapes at the beginning of the week for the incremental jobs, and left that tape in all week, then changed it Friday for the weekly/monthly job, you would use only ~ 8 tapes a month, and that would give you more retention, and more justification for a GFS rotation.
Weekly Template settings Full Weekdays 2nd Fri 3rd Fri 4th Fri Last Fri
Monthly Template settings Full 1st Fri
And then I wonder about the setting (under each template) "When this job begins" Should I Check "Overwrite Media" or leave to settings at "Append to media, overwrite if no appendable media is available".
I will change backup tape everyday, so I will not leave one in the whole week (Mon-Thu).
I still am I bit confused about the media set settings
Media set 1 Settings Daily (meaning 4 tapes named Mon, Tue, Wed and Thu) Overwrite protection 5 days Append period 1 day
Media set 2 Weekly (4 tapes named fri1, fri2, fri3 and fri4) Overwrite protection 15 days Append period 1 day
Media set 3 Monthly (12 tapes named Jan, Feb etc?.) Overwrite period 50 weeks Append period 1 day
Is it ok with the append period setting? Or should I change it to hours?
Under the Grandfather Strategy you can use minimum 19 tapes effectively for 1 year. Depending upon your requirements you need to set the Overwrite Protection Period(OPP) and the Append Period(AP) to the media set
For more details on this scheme, you can refer to the following technotes which will give you information about creating a Rotation scheme :