About Medium Blob field in MySQL

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MySQL

Dear Friends,

I am using a MySql Server and I did create a table where I am saving a lot of documents.

The documents that I am saving are only PDF and each document dont exceded the 16MB.

My question is about the size of the disk in the server that hosting the database, because I

have registred 80 documents and the size of my backup file in the database is 116 MB.

Then, when I will have 1000.00 documents the size of my backup file will be increasing

considerably, this is the point that I don have clear, because I want keep a size of backup manageable, there is a way that I make a perfomance in the size of my mediumblob field in the
table?

what will be you recomentation about this case and your point of view.

Please give me your advices and your technical arguments about the use of Mediumblob data type
in my database.

Thanks in advance.

Leonardo Ayala R.