Dependencies would be pulled into snapshot:
    [snap1]: Snapshot from mirror [wheezy-main]: http://mirror.yandex.ru/debian/ wheezy
from snapshot:
    [snap2]: Snapshot from mirror [wheezy-backports]: http://mirror.yandex.ru/debian/ wheezy-backports
and result would be saved as new snapshot snap3.
Loading packages (60863)...
Building indexes...
[-] rsyslog_5.8.11-3_amd64 removed
[+] rsyslog_7.6.3-2~bpo70+1_amd64 added
[-] rsyslog_5.8.11-3_i386 removed
[+] rsyslog_7.6.3-2~bpo70+1_i386 added

Snapshot snap3 successfully created.
You can run 'aptly publish snapshot snap3' to publish snapshot as Debian repository.