Is there an app., terminal method, or other means of file comparison / way of comparing files to determine whether there are personal data or downloaded files on a Time Machine backup, that do not exist on my present internal data drive?
Thank you!
Mac mini, OS X Mavericks (10.9.1)
Take a look at Back in Time. I'm not sure if it does what you want but it is the only TM utility I know of that expands on Apple's TM interface. Due to the way TM works, I'm not sure a folder comparison application would work on a TM folder.
This procedure is a diagnostic test. It makes no changes to your data.
Please triple-click anywhere in the line below on this page to select it:
tmutil compare | open -ef
Copy the selected text to the Clipboard by pressing the key combination command-C.
Launch the built-in Terminal application in any of the following ways:
☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)
☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.
☞ Open LaunchPad. Click Utilities, then Terminal in the icon grid.
Paste into the Terminal window by pressing the key combination command-V. I've tested these instructions only with the Safari web browser. If you use another browser, you may have to press the return key after pasting.
The command may take several minutes to run. Wait for a new line ending in a dollar sign ($) to appear below what you entered.
A TextEdit window will open with the output of the command. Each line that begins with a plus sign (“+”) represents a file that has been added to the source volume since the last snapshot was taken. These files have not been backed up yet.
Each line that begins with an exclamation point (“!”) represents a file that has changed on the source volume. These files have been backed up, but not in their present state.
Each line that begins with a minus sign (“-“) represents a file that has been removed from the source volume.
Files that you’ve excluded from backup, or that are excluded automatically, are ignored.
At the end of the output, you’ll get some lines like the following:
-------------------------------------
Added:
Removed:
Changed:
These lines show the total amount of data added, removed, or changed on the source(s) since the last snapshot.
Caution: Under some conditions, tmutil may falsely flag files as not having been backed up when in fact they have been. It can be confused by multi-linked files, or by files with a modification date earlier than the one in the snapshot. This will not be an issue for most users. If the results of the above procedure surprise you, inspect your snapshots directly.
Comparison of Time Machine backup files with other personal data files?
