Sync is the process by which your content is synchronized (synced) between your cloud storage, computers and mobile devices. It means the latest versions of files are always at your fingertips. Let’s look at how this works.
Sync happens automatically in your Dropbox account. If there’s a change—a new file, folder, or Space, an edit to an existing file, or a deletion—Dropbox will update those changes from one device to all other connected devices.
All updates happen in the background, as long as you have an active internet connection, you have the Dropbox desktop or mobile apps installed, and you’re signed in. If you’re offline, files in your Dropbox folders and Spaces will sync as soon as the device is online again.
With Dropbox Smart Sync, you can set content to be online-only, but still see it in the Dropbox folder on your computer’s hard drive. Simply double-click the file, folder, or Dropbox Space, and it will automatically download to your hard drive.
With Smart Sync and selective sync, you can spend less time managing your storage space and more time doing work that matters.
You can open a file as usual through the desktop app, its native application, Finder (Mac), or Windows Explorer. The file then automatically downloads to your computer. This file will continue to be synced to your Dropbox account, but it will also use space on your hard drive.
With selective sync, you can free up hard-drive space by moving content off your computer and into the cloud only.
Selective sync is a Dropbox feature that allows you to choose which files to remove from your hard drive. You’ll still be able to access them on dropbox.com, but they won’t appear on your computer. Selective sync helps you save space on your computer without deleting anything from your Dropbox account.
If you haven’t already, install the Dropbox app for your computer.
Click your profile picture or initials.
Select Preferences… from the menu.
Click Selective Sync… (Windows and Linux) or Choose folders to sync (Mac).
Uncheck the boxes of any folders or Dropbox Spaces that you don't need on your computer's hard drive. They’ll still be available in your account on dropbox.com.
Note: Any folders or Spaces with a check are currently downloaded on your computer
When you're done, select Update.
Dropbox works differently on your phone than it does on your computer: the mobile apps don’t save files to your devices, but rather show you your files in the cloud, just like on dropbox.com. Even when you open and edit a file on your phone, you are still interacting with the file in the cloud rather than downloading it directly to your device.
To access your files without Wi-Fi or data service, you can make files available offline by turning on the Available offline option. Need to go a step further? Tag an entire folder or Dropbox Space to have its contents available offline on your phone or tablet.
In the Dropbox mobile app, browse to the file you’d like to make available offline.
Tap the ... (ellipsis) icon next to the file name.
Tap the Available offline toggle.
To access your offline files, tap Offline from the menu (Android) or Dropbox tab (iOS) on your Dropbox mobile app.
In the Dropbox mobile app, browse to the folder or Space you’d like to make available offline.
Tap the ... (ellipsis) icon under the item's name.
Tap the Available offline toggle.
To access your offline folders and Spaces, tap Offline from the menu (Android) or Dropbox tab (iOS) on your Dropbox mobile app.