I've just reinstalled it to have a look at the options. I've never used it for at least a year.
From what I understand now (I didn't want to flash cwm) when you store them on a PC they're on a .zip format. To restore you just copy it back to your internal storage/sdcard then use the backup/restore option.
Personally I wouldn't buy the premium. I did long ago but it's outdated and rarely updated.
Best option for backing up is Titanium Backup Pro. Constantly updated and responsive devs.
There are loads of free options. You can even use something like obackup to perform online nandroid backups or just even use recovery and perform a nandroid.
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Any sufficiently advanced bug is indistinguishable from a feature.