Disavow File for Google - should I include new domains or all of them

[AlmostHuman]

Like many of folks here, I have to toy with disavow tool every now and then to purge my site from bad links.

I've heard someone assumed that not only do you have to specify new domains/links in a disavow file you want to get rid of, but also those you disavowed earlier.

The party who said that believed that there is one and only one disavow file stored in Google, so whenever you upload a new one, the old one gets replaced along with the domains specified in it.

Hence, you have to include all the links/domains you wish to disavow along with those disavowed earlier.

There is no backup of the theory from Google as far as I know, so my question is simple - is it true and is there any proof of it?

Thanks.

[Robert Charlton]

To rephrase to the possible choices... are you asking...

a) whether your disavows are refreshed each time you disavow, so you must start over each time with a completely new list?

b) or whether your disavows are cumulative... so your disavows are added to a running list?

[aakk9999]

This is just a speculation, but I would imagine that Disavow file is replacing the previously submitted one, hence it should include all previously disavowed links/domains plus the new ones.

Otherwise, if you disavow a link/domain by mistake, you could never get it back to be a valid link to your site as there is no "remove disavowed link" submission to Google.

[lucy24]

It would have to be a single comprehensive list, because there's no way to revoke a disavow (uh... reavow?) is there? I know I read the instructions once, but now I can't find the page.