How to get into Synology DS415+ backup?

Question

Backup

How to get into Synology DS415+ backup?
Several files were deleted from the storage via Windows Explorer, so there was nothing left in the DS recycle bin. Weekly backup of the entire resource was configured...
How can I extract these files from the copy? Offers only the restoration of the entire copy... On behalf of the admin, I can not get into the backup folder even after setting the rights for him to this folder... What should I do?(

Answer 1

I was able to get into the backup folder via SSH with SUDO, it wouldn't let me go without it. Thanks to all.