Sync is not backup. For backups you also need the ability to look back at the previous versions of your files. For example in your sync solution if a file gets

Sync is not backup. For backups you also need the ability to look back at the previous versions of your files. For example in your sync solution if a file gets corrupted, all copies of the file will also have the corrupted bytes sync'd. With a backup solution you'll be able to rollback to a previous non corrupted version.