When I first installed Tumbleweed a few weeks ago, a repository was added: openSUSE-20200819-0. It is still included in my configured repositories. Is it necessary to keep it, or can it be safely removed?
That is the install medium you used, maybe still connected or inserted.
You can safely remove it and it is of little use anyway on Tumbleweed since most packages have been rebuilt meanwhile.
Remove that repo.
It is useful shortly after install. You might be adding additional software, and it is faster to get that from the DVD installer if it is there.
But you are not 2 weeks away from that install. The further away from the install, the less useful that repo is. And, in fact, it can become a problem because it can prevent some software from being updated properly.
Go ahead and remove it. And, after removing, do another “zypper dup” to see whether that removal changes anything.
Thank you, @OrsoBruno and @nrickert. That was what I thought, but I wanted to be sure instead of messing something up.
Repository name can be anything and does not provide information sufficient to tell whether this repository is needed or not. Any question about openSUSE repositories must include output of “zypper lr -d”. In this case repository is created during installation and is never renamed after that - but it may be valid one. I still have repository named openSUSE-20170729-0 which points to download.opensuse.org and is perfectly valid and of course is necessary for receiving TW upgrades.
What exactly makes you think it is from DVD?
Here it is DVD or USB with the DVD installer. But you are right, that it could be the main repo if the NET installer was used.
Yes, I downloaded the minimal image and dounloaded a couple of thousand packages, afterwards.