How can I load backup from previous savings

Draakrene wrote:

How do I restore from previous backup on iCloud

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

my notes got deleted

It’s almost certain those notes were not backed up. You should tell us where the notes were housed.

Draakrene wrote:

iCloud got modified by mistake

I cannot imagine what this means.

If your notes were stored in iCloud, assuming you’re using the iCloud account where this occurred, tap “<Folders” in the upper left, find the “Recently Deleted” folder, and that’s your best (likely only) chance to find the notes.

It sounds like the notes are gone.

If you're missing notes on your iPhone, iPad, or iPod touch - Apple Support