Mog Kupo (./16) :
Have you ever had it freeze up when the archive space is getting full, then on being reset half the archived files have disappeared?
That happened earlier to me when I was trying it on my real hardware, it's like the garbage collection is collecting things other than garbage...

I confirm that EM_GC is buggy and may lost data on Garbage Collection or even freeze
I'll provide a fix

Mog Kupo (./17) :
And just had a possibly related issue where I unarchived and deleted a meg of files but the free space didn't increase at all, the files are gone but still the archive space is indicated used.

I have reproduced the issue.
I'll provide a fix