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deb http://ftp.uk.debian.org/debian/ testing main contrib non-free
deb-src http://ftp.uk.debian.org/debian/ testing main contrib non-free
deb http://security.debian.org/ testing-security main contrib non-free
deb-src http://security.debian.org/ testing-security main contrib non-free
Moving from Stable to Testing isn't an upgrade. In fact, in many respects, it's a downgrade. Packages are in Testing because they're not always stable, so there are significantly increased chances of something crashing your system. More importantly, security updates take longer to get through to Testing, meaning that you could be exposed.
If there is a particular package that has a feature that you specifically need, but the version in Stable doesn't have that, then backport that package only. At least the rest of your system will be stable.
Bulkley wrote:If you have to ask you're probably not ready.
I ask because the Debian Administrator's Handbook seems to be out-of-date. It gives an example sources.list in §6.1.3. with the following for testing security:
I think both still work. I would use https://deb.debian.org instead though, that covers Security. But having said that testing is the worst choice if security is a concern (see the above posted link for more on this).
deb http://ftp.us.debian.org/debian/ bullseye main contrib non-free
deb-src http://ftp.us.debian.org/debian/ bullseye main contrib non-free
deb http://security.debian.org/debian-security bullseye-security main contrib non-free
deb-src http://deb.debian.org/debian-security bullseye-security main contrib non-free
deb http://ftp.us.debian.org/debian/ bullseye-updates contrib
deb-src http://ftp.us.debian.org/debian/ bullseye-updates contrib