The first and most reliable way to avoid accidental deletion or other forms of data loss is to make regular backups of your important files
User error isn’t the only way you can loose important data, photos, schoolwork or projects. You can experience a sudden power outage or power surge or even a dead hard drive. In case of hard drive failure, don’t keep your backups on the same drive you are backing up. Use another drive or burn them to a CD.
There are also free and paid online storage sites. A few offer up to 5GB of free space and include sharing. With any free storage site read the fine print. Some sites allow larger amounts of space but they limit uploads per month (1GB or less). In other words you can’t get large files uploaded all at once