How can I access may first iCloud backup?

Hi rons000,

welcome to the Apple (user-to-user) Community.

Wondering what you deleted ... the photos and videos, or the back-up ?

For accidentally deleted photos and videos, they may stay in Photos > Albums > in the "Recently Deleted" Album in the Utilities section, where they can be recovered.

Eg: If you're missing photos or videos in the Photos app - Apple Support

scroll to "Recover deleted photos or videos" in the article: Delete photos on your iPhone or iPad - Apple Support

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Re: first iCloud backup

An iCloud backup keeps a current copy of the data on your iPhone. Once deleted it would likely be gone.

If you just need to locate that particular back-up:

Check for the photos and videos : What does iCloud back up? - Apple Support

and

How to: Locate backups of your iPhone, iPad, and iPod touch - Apple Support

How to: Restore your iPhone, iPad, or iPod touch from a backup - Apple Support

Else:

Check for copies of the photos and videos:

How to: Archive or make copies of the information you store in iCloud - Apple Support

More support if needed:

You may want to reach out to Apple's Photos Support:

Photos Support Website (info / support / contact)

There is a "Get Support" link (online chat, phone, eMail) at the bottom of their website

Photos - Official Apple Support

All the best :-)