I have some sensitive work data on my mac that i keep in an encrypted backup. It's a big file of about 19gb.
I can open and access it fine using the password i set, however, i have noticed that every time i do this and then open some of the files within and then finish and dismount the volume, time machine will begin backing it up.
However, it doesn't simply back up just the changes i made, it backs up the entire encrypted image again and so makes a duplicate of it, this is rapidly using up space on my time machine drive, is this supposed to happen and how do i stop it?
NB: It also does this even if i don't make any changes to the encrypted image and simply view some of the files within the volume and then close it.
Many thanks for any help you can give.