I installed Hardi Backer under a ceramic tile floor several years back. We are planning a remodel soon. Can I remove the tile, clean up the backer board, and install new tile? That stuff has a million screws in it! I would really like not to have to remove it.
The tile, if installed correctly will not come off the backer board cleanly, it will leave behind thinset or rip up chunks of backer board when you demo it. Even if it was relatively easy, keeping the flatness spec of 1/8" within 10' and 1/16" within 6' will be hard to meet with reused board. Its best to get back down to the subfloor to inspect anyways and install new clean board or use an uncoupling membrane like Schluter Ditra in the future.