You won't have to store your contacts or calendars each time there is something new, with BeMyPhone you can set a reminder period for synchronisation. This way your phonebook and events will always be up to date.
Go to “settings”, “options” and in the section BeMyPhone tap on “Sync data”. A period of one week is set by defect, but you can change it in this same screen. When the period set has elapsed, you will get a notification to remind you that you can synch. Just tap on the notification and follow the steps indicated to synch your data.
Apps, images and videos must be synced from their corresponding sections.