Page and Domain Authority
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How much Page and Domain Authority we need to look for to secure a backlink.
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I am not sure but if you are asking how much DA and PA is required in an incoming link that will be considered as safe. If this is your question then there is no such restriction or recommendation in this area.
If the website from where you are getting a link have a clean link profile and no SPAM links pointing to that site then in that case no matter what the DA or PA of the website is the link from that website will be secure.
Similarly, If a website that is pointing back to your website have a decent DA and PA but link profile of that website is spammy, in that case the link will be considered as a risky link.
If the website is quality and link profile is clean then having a better DA and PA from where the link is coming will be considered as a lil more powerful as compare to a website that contain a lesser DA and PA.
Hope this helps!