Originally Posted by melorib
Found it, they are in a folder inside TWRP/BACKUPS
Yeah, that's where they should be, both on the internal memory and the SD card unless you customize that path yourself.
However, my problem still remains and I think I found out why. It has been overwriting my backups due to a bug that TWRP 220.127.116.11 exhibits: it can't set date/time correctly.
Right now for example it's saving my date in backup folder: /external_sd/TWRP/BACKUPS/<id>/2014-01-23--18-06-31 KOT....
The time displayed above is 6:17PM right now, which coincides with army time 18:00 hours.
Normally the minute and second would make a difference, but who knows, maybe it took me the same amount of time to slide to backup as it did before it happened to be overwriting, because my other backups are nowhere to be found. I've restored each one of them, and all are older versions, not the one I know I backed up specifically.
You hear me TWRP devs? You have a bug in this version. Check for date/time bug.