How to periodically monitor changes in files in a directory in Linux?

Question

linux

A large archive of files is stored in some directory. After some time, not in real time, I want to be able to view a list of files that have been added / removed / changed (like the diff command for directories).
As I understand it, an index file or something like that should be created, so that then some utility can scroll through the list of files (or create HTML / TXT).
I want to manually carry out this operation every time before backing up data in order to check what needs to be stored and what not.

Answer 1

incron

Answer 2

You can use a utility like inotify-tools, but if there are a lot of files, it can affect performance.
If it is enough to periodically check - then yes, create an index where to store the date of modification / creation of the file and something like its md5 hash.
Periodically, by krone - build a new index and check with the previous one.

Answer 3

1.
if you need to synchronize it (I use a database)
2.
rcync- as a simpler option (has a built-in function)
3.

find  
-mtime — время последнего изменения файла (в днях).
-mmin — время последнего изменения файла (в минутах).
 и тд

Give a more detailed description of why you should follow, and perhaps there is a ready-made solution.