Debian GNU/Linux 10.7.0 "Buster" - Official amd64 DLBD Binary-2 20201205-11:17 (20201205)
These ISOs are useful for a completely offline Debian repository.
1. Use gpgv to verify the signed hashes available at https://cdimage.debian.org/debian-cd/current/amd64/jigdo-dlbd/
2. $ mount /path/to/debian-10.7.0-amd64-DLBD-1.iso /mnt/disk1
3. $ mount /path/to/debian-10.7.0-amd64-DLBD-2.iso /mnt/disk2
4. Add the following entries to /etc/apt/sources.list:
deb file:/mnt/disk1/debian buster main contrib
deb file:/mnt/disk2/debian buster main contrib
5. # apt update -o Acquire::AllowInsecureRepositories=True