I had around 245gb for my initial backup. The hard drive I backed up to had 465gb of free space. Now Time Machine won't do any hourly backups because it says there's not enough space. Isn't it just supposed to delete old backups when free space runs out? Also the hard drive has 223gb of free space right now. The incremental backups can't be all that big since my files haven't changed very much since the initial backup.