Differential backup files--how long should I keep them?

Our SQL server administrator had scheduled SQL diferential backup every night since February 2012. The backup files have been stored in a folder on the server which now has the size over 8 GB. All the differential backup files are in this folder.
I am thinking we only need them for 30 days (with the full backup available). So can I remove the differential backup files manually? Thanks!

. I am thinking we only need them for 30 days (with the full backup available). So can I remove the differential backup files manually? Thanks!
You should not ask this question here how can we tell whether you can remove anything or not. But yes keeping Diff files from 2012 onwards on harddrive is not a good idea. Discuss same with you manager of course you need to to delete and keep files only for
a month.
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Differential backup files--how long should I keep them?

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