iPhone Deve Team has released end of April Redsnow 0.9.10b7 then after couple of days they have released Redsnow 0.9.10b8 and also 0.9.10b8b versions. These are compatible with MAC and Windows both platforms. They have solved issues and released new versions for you.
Latest version has additional features like File backup facility.
You can get backup file form device to your Personnel Computer or MAC. This version has an ability to make Zip files. Zip filese more compatible with the native Windows explorer.
Following screenshot will show 0.9.10b7 and 0.9.10b8b difference. Please click extra button — > Even More — > Then you can see Backup. This need your device jailbroken with the afc2 with enable. I think this will be useful thing to you.