Virus Complacency -- Though there are few Macintosh viruses (especially in comparison to the PC world), in the last few weeks I've received several reports of virus-infected CD-ROMs or files (the most recent one an upload caught by alert Info-Mac archivist Michael Bean). Although all the viruses were old and easily handled by John Norstad's free Disinfectant 3.6, I believe many Macintosh users have been lulled into complacency by the minimal virus problems of late. In addition, many people have become Mac users in the last few years, and thus missed the era when most Macintosh viruses appeared. Most existing Macintosh viruses aren't particularly dangerous, but it's always worth running an anti-virus program. For more information on the different viruses, read Disinfectant's excellent online manual by selecting Disinfectant Help from the Apple menu. If you feel like spending money (we at TidBITS recommend and use Disinfectant), check out commercial virus protection software like Symantec AntiVirus for Macintosh and Datawatch's Virex for Macintosh. [ACE]
Extract Directly from Time Machine
Normally you use Time Machine to restore lost data in a file like this: within the Time Machine interface, you go back to the time the file was not yet messed up, and you restore it to replace the file you have now.
You can also elect to keep both, but the restored file takes the name and place of the current one. So, if you have made changes since the backup took place that you would like to keep, they are lost, or you have to mess around a bit to merge changes, rename files, and trash the unwanted one.
As an alternative, you can browse the Time Machine backup volume directly in the Finder like any normal disk, navigate through the chronological backup hierarchy, and find the file which contains the lost content.
Once you've found it, you can open it and the current version of the file side-by-side, and copy information from Time Machine's version of the file into the current one, without losing any content you put in it since the backup was made.