... or if you're really just looking for which files to backup, based on the contents of those files matching some regex pattern, consider using the "grep -l", aka "grep --files-with-matches", option. It might be a wee bit faster or less consumptive of file system buffers on large files that have at least one match early on, and based on my 20 seconds of testing just now, it (grep -l) examines all files, whether binary or not, unlike the default grep, which without the -l option chooses not to search binary files, and complains (now on stderr) instead.
-- Paul Jackson p...@usa.net