Is sync on safe?

Could you please clarify what you mean by "sync on"? Are you referring to synchronizing cryptocurrency wallets, exchanges, or other financial services? In general, the safety of synchronization depends on a few factors, such as the security measures implemented by the service provider, the strength of your own passwords and security practices, and whether or not you are using secure and up-to-date software. It's important to be cautious when it comes to your financial security and to thoroughly research any service you are considering using before entrusting it with your funds.