Wasabi is designed to provide eleven nines (99.999999999%) durability of objects over a given year. This durability level corresponds to an average annual expected loss of 0.000000001% of objects. For example, if you store 10,000 objects with Wasabi, you can on average expect to incur a loss of a single object once every 10,000,000 years.
As with any environments, the best practice is to have a backup and to put in place safeguards against malicious or accidental user errors. This best practice approach includes secure access permissions, versioning and a functioning, regularly tested backup. In addition, Wasabi provides durability and compliance at the storage bucket level to prohibit deletion of the data in a bucket.