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Hi there, I am Pete and I'll be happy to assist you today.
The dmp, or dump, files are created as part of the backup process so that the phone can recover quickly if something goes wrong.
It is not uncommon to have hundred or even thousands of old dmp files on your phone.
However over time they do start to take up space, so you can clear them out if you need to free up some memory on the phone.
Please let me know if you have any further questions on this topic and I'll be happy to help.