Where does Transmission save my torrent files?
Transmission stores your torrent files in your standard config folder, at ~/.config/transmission/torrents where ~ is your home folder.
The .config folder is usually hidden. To get there, open the File Browser and go to your home folder. Choose View > Show Hidden Files in the menu, then look for ".config". In that folder you'll find transmission, and the rest should be pretty straight-forward. (By the way, to find a file in a long list you can just start typing its name).
The torrent folder contains every current torrent, and it includes torrents downloaded from magnet links as well. You can just open those with another client and it will work right away.
Remember to turn Show Hidden Files back off later on, or you'll see a lot of strange looking files:
Check here too:
If you're daemonizing transmission on Ubuntu (using the package transmission-daemon) and using a gui then:
This data is stored in /var/lib/transmission-daemon/info (requires root access to view, use sudo from the command line or install nautilus-gksu). Specifically, your torrents are in the directory /var/lib/transmission-daemon/info/torrents.
In complement for the daemonized transmission, you can check theses files :
/etc/init.d/transmission-daemon for changing user executing transmission,
/etc/default/transmission-daemon for finding CONFIG_DIR="/var/lib/transmission-daemon/info"
The "config_dir" info is a symbolic link to /var/lib/transmission-daemon/.config/transmission-daemon and here we can found another link settings.json to /etc/transmission-daemon/settings.json
Now you can fully customize your transmission's directory structure
If you run the command
ps ax | grep transmission
and it results with
/usr/bin/transmission-daemon -f --log-error
then you can try to edit the /lib/systemd/system/transmission-daemon.service file:
ExecStart=/usr/bin/transmission-daemon -f --log-error --config-dir=/your/config-dir
The directories and files (e.g. settings.json) in /your/config-dir has to have rw permission for debian-transmission user or group (the name depends on your distribution).
Follow this link for details: https://forum.transmissionbt.com/viewtopic.php?t=16642#p69968