Why would Finder report a 13 TB Backups.backupdb on a 3 TB drive

I’m backing up a lot of data with Time Machine but when I checked the file size of my backup it says that the Backups.backupdb is 13.03 TB yet my drive is only 3 TB. Does anyone have any idea why I’m getting such and inaccurate size?

HFS Compression isn't yet really a visible function for the average user. It's very low-level, and is applied when items are written to suitable drives only if the application initiating the copy or move (in your case, Time Machine) specifically requests HFS Compression. It's not a case of having a whole filesystem that is set up to compress anything written to it; rather, you can apply HFS Compression on a file-by-file basis. It's only available in OS X 10.6+, and only on HFS-formatted volumes; any files so compressed will be unrecognized in earlier versions.
Whilst I can't guarantee that Time Machine uses HFS Compression, in the event that it did it's unlikely that one week's worth of data could amount to 13TB, as you say.
So, I'm afraid, as they say on Dragon's Den: I'm out. Maybe someone else will be of more help.
Merry Christmas!
S.

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Why would Finder report a 13 TB Backups.backupdb on a 3 TB drive

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