Rated 4 out of 5 stars

Do not work at startup with RSS-accounts.
I try to use Awesome Auto Archive

Αυτή η αξιολόγηση γράφτηκε για παλιότερη έκδοση του πρόσθετου (0.9.2). 

Can not reproduce this.
Need more details of setup.

Rated 5 out of 5 stars

But manually archiving works good in RSS-accounts...

Αυτή η αξιολόγηση γράφτηκε για παλιότερη έκδοση του πρόσθετου (0.9.1). 

See the new version 0.9.2. Now it can also archive RSS accounts (but with default archive settings only, because the Thunderbird aechive settings are not available for Feed accounts)

Rated 5 out of 5 stars

But can it works with RSS-accounts?

Αυτή η αξιολόγηση γράφτηκε για παλιότερη έκδοση του πρόσθετου (0.9.1). 

Archiving of RSS accounts is not possible in Thunderbird. Therefore the addon can't do it.

Maybe you can create a Filter which moves the RSS messages to a folder inside a POP3 account. Then you can archive this one. Sounds a bit tricky but may work.