Is this an advisable practice? I recently started using Time Machine since I now have an external HDD (never needed one before), but I noticed that on my Macbook Air SSD the section for "Backups" in "About my Mac" was taking up a lot of space. I found out that Time Machine keeps local backups on purpose, however I find it unnecessary since my external HDD is my backup and I don't want my SSD being filled up for no reason. So I discovered that turning TM off and then back on will clear up the space, however I have to do this every now and again as the space starts to slowly get taken up. I don't really see the point of keeping those local backups, does anyone else do this?