SEPM Embedded DB size limitation for restore

Hi all , I have two questions would really appreciate your helpful and kind replies.

1. Is there any limit on the size of sem5 database ( embedded database ) that we can backup or not . for example if sem5 exceeds 15 GB we cannot backup it up via the SEPM Backup utility
2. Is there any limitation on the size of DB that we can restore via SEPM restore utility . for example if the size of DB exceeds 20 GB we cannot restore it via the Restore utlity of SEPM

I remember I read somehwere that there is a limit on size of DB if it exceeds then we cannot restore it . Please correct me if I am wrong . Thanks