Problem :
Is there a way to back up applications installed after a certain point in time?
Example: I would like to back up all the applications that have been installed within the last month. Is this possible? It’s okay if it’s not an entire application and just an upgrade too that counted as an installation.
Solution :
This command
find /start/directory -type f -atime +n -print
will find and write to stdout all files accessed more than n days ago. If you wish to find those that were modified more than n days ago, use mtime instead of atime.
You can now modify this command to provide a backup, like
find /start/directory -type f -atime +n -exec cp {} /backup/dir ;
or simply you can output all file names to a file
find /start/dir -type f -atime +n -print > file_list.txt
and then act on this list as you see fit.