After the owner's electricity purchase record is deleted, can the property manager restore it?

The property manager deleted the owner's electricity purchase record and could not restore it.

When operating the computer, if you don't save it, the computer will automatically save the information you operate in the memory. When saving, the data will be stored in the hard disk.

One of the characteristics of memory is that once the computer is turned off, all the information in the memory will be emptied, so your data will be gone. How can you recover it?

The owner can find the record when paying the fee, but if there is no backup on the computer, there is no way. Do you need this reimbursement or as a voucher? If not, it doesn't matter much. If necessary, you can print a copy at the local electricity payment office. Payment records will be fine.