I have my Calibre folder backed up with BT Sync and unDRM my kindle books there, so I can open them on anything with BT Sync installed. I always buy with Kindl

I have my Calibre folder backed up with BT Sync and unDRM my kindle books there, so I can open them on anything with BT Sync installed. I always buy with Kindle and convert with Calibre then read in iBooks. It'd be nice not to have to do that.