File versioning

File versioning automatically saves earlier states of a document each time you change it, so you can restore a version from yesterday or last week. It is invaluable when you overwrite something by mistake, a file gets corrupted, or ransomware ✕ Ransomware is malware that encrypts your files and demands a ransom to release them. An up-to-date backup is the best protection against it. More in the glossary → encrypts your data: instead of losing everything, you restore the last healthy version. Each service keeps history for a different length of time —from 30 days to a year or more on higher plans— an important detail when comparing. It does not replace a full backup ✕ A backup is a copy of your data kept in a separate place, letting you restore everything after data loss, hardware failure, or a ransomware attack. More in the glossary → , but it is an excellent safety net for everyday work. How much history each provider offers is covered in the best cloud storage comparison.