Time Machine - How can I backup only Documents folder I'm trying to backup Documents folder only. Folder contains 10GB. Entire User folder is about 50GB.
When trying to exclude all folders (included hidden ones ), I get to 48GB of backup storage required.
What do I do wrong ?
The estimates are often off to be conservative, make sure enough space is there to not run out if the estimate is not perfect.  Just exclude every folder and allow a token empty one to back up. After several intervals, the estimate will be better and you can add documents back by removing it from the exclusion list.