1. rsync with inotifywait:
   Use rsync in combination with inotifywait. inotifywait monitors file system changes on server A, and every time a change is detected, rsync synchronizes the files with server B. This method is very efficient for almost real-time synchronization.

   Example script:

   #!/bin/bash
SRC="/path/to/sync"
DEST="user@serverB:/destination/path"
inotifywait -m -r -e modify,create,delete $SRC | while read path action file; do
rsync -avz $SRC $DEST
done

2. Lsyncd:
   Lsyncd (Live Syncing Daemon) is a more advanced tool that uses rsync for synchronization and inotify to monitor changes in real-time. It is easy to configure and runs as a background daemon.
3. lftp:
   Although lftp is not specifically a real-time synchronization tool, you can use it for frequent syncs using its mirror command with the --continue option to synchronize directories between servers A and B. However, this is not a real-time solution but requires periodic execution.

   Example of lftp usage:

   lftp -e "mirror --reverse --delete --continue --verbose /local/directory /remote/directory; bye" -u user,password serverB


   Note: While lftp can be useful, it doesn’t provide real-time synchronization. For that, rsync with inotifywait or Lsyncd are better options.

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