Backup/Restore
If a file is lost from your account (e.g., if you accidentally removed a file you need), the file can usually be restored, since filesystem snapshots are done on a regular basis for most user-accessible filesystems unless requested otherwise. If you lose a file from your home directory or project space, it can usually be recovered by looking in the snapshot tree. If, however, your file was lost from a filesystem on which snapshots have been disabled, or if it is not in the snapshot tree for some reason, it is likely not possible to recover.