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backup scheme

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Is it logical to have a backup scheme where I do a weekly image with a full version after 5 differential versions and delete chains older than 36 days (5 diff. x 7 days/week + 1)?

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Ed, welcome to these public User Forums.

The key questions related to your question about backup scheme are:

What is the average size of your Full plus 5 Differential backup files?

What is the size of your Destination drive where the backups will be stored?

Next, if you are running this backup scheme weekly, you need to understand that nothing will be deleted until 36 days after the next new Full backup file has been created, so after 6 weeks plus 36 days.

Personally, I prefer to use the alternative scheme to 'Store no more than X recent version chains' as I find this easier to manage and understand what I can store on my own backup destinations.