SyncDocs is one of the best ways to synchronize your Google Docs account and your PC. But SyncDocs doesn't just go one way. This easy to use app allows you to sync any folder (on your PC) to and from your Google Docs account. All files are copied locally (so you don't have to be on line for access) and files are encrypted on line. SyncDocs also has an option document conversion, which will automatically convert your documents to the Google Doc format. The free version of SyncDocs syncs a limited number of files. For $19.95 USD/year you can get access to unlimited sync (up to 5GB - you can purchase more space as needed).
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