Full Backups

I currently perform a differential backup on a daily basis, and I perform a full backup with system state once a month.

When performing the monthly backup, rather than backing up absolutely everything (which I imagine would take ages). Do you know of any guidelines that I should follow, in order to backup all necessary, critical files needed for a restore, system files etc, but not to backup the unnecessary files that are not relevant to the restore.

Thanks in advance

 

 

 

 

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