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So this is something weird. Normally, when attempting to save over a file, you'll get a dialog box that says "This file already exists, do you want to replace it?" However, when saving over a file, I get no such message. This is a problem as I accidentally just saved over one of my scene files by mistake and didn't realize I had the wrong name until it was too late. There doesn't seem to be anyway to recover it either. Why is it not doing this? And is there a way to get the file back?

OSX El Capitan 10.11.4

Well I've found the culprit. Apparently, probably due to a software update, the option to ask when saving was unchecked. It's now been fixed and those responsible have been sacked. But it would still be nice to recover the file. I keep everything in Google Drive so I'm going to see if there's a way to do it from there.

you can use the multi-backup option to avoid mistakes.