Time Machine back-up disk too small

Recently I had to restore my system from a Time Machine back-up, all seemed to work fine. Now I have a situation where time machine gives me an error when I attempt a back up, saying there's not enough free space on the back-up drive. The drive I'm backing up is max 500megs, the external BU drive is a TB. I fixed all the prefs but it seems as though Time machine is not deleting old files from my BU drive to make room for new ones. Any ideas?

OrangePanda wrote:
Hi, I have the same problem.
My backup drive (G-Tech Q 500Gb) has 465Gb of space and my Pro has only 434Gb,
Your backup drive is much too small. To work well (and keep a reasonable number of backups for you), TM usually needs roughly 2-3 times the space of the data it's backing-up. See item #1 in the Frequently Asked Questions *User Tip* at the top of this forum.
yet when I tried to update it says I still need 63Gb of space??? I downloaded the Time Machine buddy recommended here, the message said that some old copies were deleted but still need 64Gb, only had 40Gb.
Did I miss something? should I just wipe my G-Tech and try again?
Short-term, probably. Without the actual messages, we can only speculate, but most likely you've made a lot of changes or for some other reason TM is trying to back-up about 54 gb (the 64 includes about 20% extra for workspace). Copy and post the TM Buddy messages here and we can be sure.
Long-term, you need a bigger drive.

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