PHP 8.1 issues?

When I try PHP 8.1 I get the below issues but fine on PHP 8.0

WordPress version: 6.0.1
BackWPup version: 3.10.0
PHP version: 8.1.7  (64bit)
MySQL version: 10.3.23-MariaDB-cll-lve
cURL version: 7.71.0
cURL SSL version: OpenSSL/1.1.1d
WP-Cron url: https://gfhfggfh.com.au/wp-cron.php
Server self connect: Response Test O.K.
Document root: /home/gggsu/public_html
Temp folder: /home/gggsu/public_html/wp-content/uploads/backwpup-67agceg3-temp/
Log folder: /home/gggsu/public_html/wp-content/uploads/backwpup-67acgeg3-logs/
Server: Apache
Operating System: Linux
PHP SAPI: litespeed
Current PHP user: gggsu
Maximum execution time: 300 seconds
BackWPup maximum script execution time: 15 seconds
Alternative WP Cron: Off
Disabled WP Cron: Off
CHMOD Dir: 0755
Server Time: 1:38
Blog Time: 11:38
Blog Timezone: 
Blog Time offset: 10 hours
Blog language: en-US
MySQL Client encoding: utf8mb4
PHP Memory limit: 768M
WP memory limit: 40M
WP maximum memory limit: 768M
Memory in use: 115.00 MB
Loaded PHP Extensions:: Core, PDO, PDO_ODBC, Phar, Reflection, SPL, SimpleXML, bcmath, bz2, calendar, ctype, curl, date, dba, dom, enchant, exif, fileinfo, filter, ftp, gd, gettext, hash, i360, iconv, imap, intl, json, ldap, libxml, litespeed, mbstring, mysqli, mysqlnd, odbc, openssl, pcntl, pcre, pdo_mysql, pdo_pgsql, pdo_sqlite, pgsql, posix, pspell, readline, session, shmop, soap, sockets, sqlite3, standard, sysvmsg, sysvsem, sysvshm, tidy, tokenizer, xml, xmlreader, xmlwriter, xsl, zip, zlib

Part of the log is below.
[INFO] BackWPup 3.10.0; A project of Inpsyde GmbH
[INFO] WordPress 6.0 on https://fdfdgdfgm.com.au/
[INFO] Log Level: Normal
[INFO] BackWPup job: Weekly Backup
[INFO] Logfile is: backwpup_log_ef5ed9_2022-07-10_01-01-06.html
[INFO] Backup file is: backwpup_TFT2ZY6R01_2022-07-10_01-01-06.zip
[10-Jul-2022 01:01:06] 1. Try to backup database …
[10-Jul-2022 01:01:06] DEPRECATED: Return type of Symfony\Component\OptionsResolver\OptionsResolver::offsetExists($option) should either be compatible with ArrayAccess::offsetExists(mixed $offset): bool, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice
[10-Jul-2022 01:01:06] DEPRECATED: Return type of Symfony\Component\OptionsResolver\OptionsResolver::offsetGet($option) should either be compatible with ArrayAccess::offsetGet(mixed $offset): mixed, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice
[10-Jul-2022 01:01:06] DEPRECATED: Return type of Symfony\Component\OptionsResolver\OptionsResolver::offsetSet($option, $value) should either be compatible with ArrayAccess::offsetSet(mixed $offset, mixed $value): void, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice
[10-Jul-2022 01:01:06] DEPRECATED: Return type of Symfony\Component\OptionsResolver\OptionsResolver::offsetUnset($option) should either be compatible with ArrayAccess::offsetUnset(mixed $offset): void, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice
[10-Jul-2022 01:01:06] DEPRECATED: Return type of Symfony\Component\OptionsResolver\OptionsResolver::count() should either be compatible with Countable::count(): int, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice
[10-Jul-2022 01:01:07] DEPRECATED: substr(): Passing null to parameter #1 ($string) of type string is deprecated
[10-Jul-2022 01:01:07] DEPRECATED: substr(): Passing null to parameter #1 ($string) of type string is deprecated