In About this Mac, Storage, the Backups takes up about 49gb, do I need this and if not how do I get rid of it?

In About this Mac, Storage, the Backups takes about 49gb, do I need this and if not how do I get rid of it?

Yes, I used TM for the first time about a month or two ago, using an external HDD to backup my Mac and my daughters Mac's as well. The exHDD has not been regularly connected to my Mac Air and I've seen a couple of warnings come up stating- Time Machine was unable to backup your computer because..... (I forget ).
Correct me if I'm wrong but if this disc space is being used for the snapshots, then as I continue to use my computer then the space used for snapshots will submit? to the other apps requiring more space. So this probably isn't something that I need to worry about?

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