I use an external HD on my MBP as TM but I do not have it always connected, therefore the system makes local backups with white label and pink backup while the external HD is connected.
I whould like to move the local backups to the external drive each time it is connected or eventually even remove this backups: the reason is to not "waste" space on the internal HD. Is it possible to do this ?
If this is not possible I would like to ask Apple to implement this option.
An alternative could be to deactivate TM if the external HD is not connected, which of course could be done manually but I do not like to do this because I am afraid to forget to activate it again.
My suggestion could be the user could select one of the follows :
a) TM Activated works only if the external HD is connected and no local backup is done. Without the external TM HD is impossible to empty the trash.
b) TM Activated saves backup locally and move this backups to the external TM HD as soon as it is connected.
You don't need to worry about filling the volume with local snapshots. They're deleted automatically when they expire, or when free space on the volume falls below a certain level.
The Finder reports the space occupied by the snapshots as "available," which it is. Think of the snapshots as putting available space to good use, instead of wasting it. It's still available for new files.