Calculating size of backups

hi everyone
i have posted this query but i dont where it has gone

i am posting again . my issue is that i have many backup files in a backup nfs share and i need to calculate it size just by adding their individual file sizes which is repetitive jobs. so is there any command or variation of

du

to use and calculate the sizes of backup files of a specific date.

regards

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Calculating size of backups

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