Too Many Warnings – Unable To Backup

First I should explain that this is an old website that I updated with a new theme a while ago, and I suspect this may be the reason I am having issues.

I am trying to do a backup of my website files (not database) but am getting errors and I don’t know how to fix them.

I reinstalled WordPress 6.3. Not sure what else to try.

WARNING: File /home/best/html { font-family: var(–global–font-secondary); line-height: var(–global–line-height-body); } does not exist or is not readable
[09-Aug-2023 23:30:49] WARNING: File /home/best/.wp-block-file { .wp-block-file__textlink { text-decoration: underline; text-decoration-style: does not exist or is not readable

ERROR: Uploaded file size and local file size don’t match.

Would appreciate any help. Thanks!

The page I need help with: [log in to see the link]