time machine and renamed files

briefly: time machine does not recognize renamed files and folders. if you simply rename a folder containing 1Gb of files without touching data inside, you'll waist extra 1Gb of backup space. more on this issue in Time Machine: Some Details

named backups in time machine

it's a pity that apple time machine does not allow to give a name or a note for a backup. unfortunately it is not possible push the button "back up now" and give a reason for this manual backup. it would be really useful for search, when you do not know thew date. additionally it would be good to keep such backup longer (forever?).