Cwm not backing up

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http://forum.xda-developers.com – OK I got my gs2 a while back rooted and right off the bat did a nandroid. My question is what's up w cwm on my defy I never had problems. Well here's the problem. I've done at least ten backups since then but it takes ages to backup. And if I try to restore anything other than that first one it takes forever to recovery then stops and says some md5 check something or other. Its really not a big deal I have since went to twrp it just erks me I couldn't get my backups to restore. All but the first backup are only 20mb its crazy t989 cm9.1 (HowTos)