CDR records not fully shown after restore

i am doing a full backup every day to an ftp server .

backup.JPG770x520 35.1 KB

and after i restore this full backup ( yesterday backup ) every thing was restored as before ( ext , setting , ect ) except that some CDR record for the last 3 month is missing ! , records before those 3 months exist without probelm

so i need to know what cause the issue . and if the restore over write the cdr , becuse those data was there before i made the restore .

here is the Database after i open it in another server. no data after aug

Nodata.JPG410x574 71.5 KB

so is there is anyway to get those data back , did this restore overwrite the cdr data ?

and why cdr backup stop backup reports ?
so is there is any way to re