Backup the list of installed flatpaks and also installs from an existing list.
usage:
flatckup [OPTION] [FILE-NAME]
flatckup -b
flatckup -b 'path-name-file'
flatckup -b 'name-file'
flatckup -r 'backup.txt'
-b|--backup) Create a backup file.
-r|--restore) Restore programs with backup file.
--version) Show version.
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