Welcome to the Candy Crush Saga Community
Do you have a question or need help with your game? Ask the Community.
Hello @natrajan and welcome to Soda community 😀
The community you originally posted on is about Candy Crush Soda but don't worry, your discussion will be moved to the Community about Candy Crush here
Since I can answer your question: boosters are saved locally on your device storage and can't be transferred or synced like gold bars and progress are. That means if you change device or uninstall the app, your boosters will be lost. You can still try to use as many boosters as possible in your old device.
More info on this guide here
Also, please keep in mind this friendly reminder: storing an enormous amount of boosters is not advised, for the good of your game. It can affect your game functionality and crashes have been reported due to this 😔