HasReadAccess checks if the provided storage allows the reading of file content.

IsInitialized checks if there is PBM init file on the storage.

ParseType parses string and returns storage type.

Upload writes data to dst from given src and returns an amount of written bytes.

ErrCancelled means backup was canceled.

ErrNotExist is an error for file doesn't exists on storage.

Type represents a type of the destination storage for backups.