my site damaged when i make a backup

[msh3egy]

i had a web site on windows server it work with control panel plesk 7.5

i had tried to make /creat a backup

then the site hang up and i am makeing a restar to the pc

when i open it agian i find the backup file with size 0 byte

and i have many many problem

1- The data base still exist but damaged
when some one call the data base we have a message that
"#1045 - Access denied for user 'rotania_testy'@'localhost' (using password: YES)"
i check the data of data base , and password and the data on the file config.php



2- the FTP account stopped

3- The DNS zone damaged as my server owner say

4- there are some file deleted