Making a NANDROID backup of a device with broken touchscreen

This is the first of a series of questions about "the broken tablet saga". Basically I have an Acer A500 with broken touchscreen to get ready for warranty. I won't ask all of my questions in a single topic. I want to make a full backup of my tablet without using the touchscreen. The tablet is rooted. How do I - **without using the touchscreen** - make a NANDROID backup of it to be restored on the replacement device Acer will hopefully send to me? (Or just to restore the repaired tablet) I currently don't have the device in my hands. I suppose it is equipped with the classic ClockworkMod recovery. As a backup plan, I would like to know what can I do to install ClockworkMod without touchscreen support. I'll have the device in my hands in a few hours. I would like to be prepared for that (including downloading any additional software or firmware from an unlimited data connection) [Update] I must install CWM **without** using Acer Recovery Installer. I can't find a link to a binary and instructions on how to flash a recovery (there are plenties of tutorials for download mode on Samsungs)