Unable to take a Backup

Hello
As i plan to have some changing on my Windows 7 system, I try to take a backup of my system
But I'm told that the appropriate service is not active
I checked and it seems to be OK

What should i check for to ensure that everything is OKand how should i proceed

Thanks Have a good day

Thank you for your answer
I looked at the services and found (as I'm french I foun,d the equivalent

• Windows Backup (Sauvegarde Windows) - enabled and manual

but did not find something that could be (or at least something that would mean)

• Background Intelligent Transfer Service - enabled and started (Automatic (Delayed start))

Is that a "standard" service that should be always present or could it be missing sometimes ?
I use Windows 7 - 64 Bits

Thanks for your help Have a good day

Thanks
As a "backup/restore" software, I use "Spotmau Power Suite" for several years
As a 3registry Cleaner", ,I use "Registry First Aid". In this software, when I try to "Create a restore point", I'm told that either the Backup service is not started is not started or that I have no administrator rights.
I checked and I am using an "administrator" account with administrator rights.
On the other end, I would like to know if there is a way to crate a Restore point i could use later, without having to boot from an external CD (like all backup tools - Spotmau, Easus, macrium, Active Disk ... seem to imply).
Is there a way to "save" only Registry and mandatory Windows files, ignoring all other folders and personal data (like programs and documents) ?
Thanks have a good day