Backup no longer works

Hello,

I hope that someone here can help me.
As of today, I can no longer create a backup of my pages created with WordPress with All-in-One WP Migration.
When I try to create a backup I only get the error message “Cannot export” “Cannot export. Reload the page and try again” I reloaded the page a couple of times and tried a backup, but it always comes again the same error message.
I am using WordPress version 5.7.2 and the All-in-One WP Migration Plugin version 7.44.
Also, no new plugins have been added since the last successful backup.
I also checked that there was enough free space left on the server. This is the case.
Since the last backup was 1.87GB in size, I also checked the hint whether it was a 32bit or 64bit PHP version. Because the current backup could be bigger than 2GB. But even here everything is as it should be.
Can someone help me so that I can create a backup again, because this plugin is really very good for backup and migration.
The following entries are in the error log:

Jun 24 2021 11:22:48
{"type":8192,"message":"Function create_function() is deprecated","file":"\/homepages\/4\/d42877117\/htdocs\/clickandbuilds\/BetaWeb\/wp-includes\/vars.php","line":13}

Jun 24 2021 11:22:48
{"type":2,"message":"unlink(\/homepages\/4\/d42877117\/htdocs\/clickandbuilds\/BetaWeb\/wp-content\/cache\/tmpWpfc\/1624533761\/referenzen\/zorn-elektroanlagen\/index.html): No such file or directory","file":"\/homepages\/4\/d42877117\/htdocs\/clickandbuilds\/BetaWeb\/wp-content\/plugins\/wp-fastest-cache\/wpFastestCache.php","line":1721}

Jun 24 2021 11:22:48
{"type":1,"message":"Uncaught Error: Call to undefined function ai1wm_storage_path() in \/homepages\/4\/d42877117\/htdocs\/clickandbuilds\/BetaWeb\/wp-content\/plugins\/all-in-one-wp-migration\/functions.php:87\nStack trace:\n#0 \/homepages\/4\/d42877117\/htdocs\/clickandbuilds\/BetaWeb\/wp-content\/plugins\/all-in-one-wp-migration\/lib\/model\/export\/class-ai1wm-export-archive.php(38): ai1wm_archive_path(Array)\n#1 \/homepages\/4\/d42877117\/htdocs\/clickandbuilds\/BetaWeb\/wp-content\/plugins\/all-in-one-wp-migration\/lib\/controller\/class-ai1wm-export-controller.php(70): Ai1wm_Export_Archive::execute(Array)\n#2 \/homepages\/4\/d42877117\/htdocs\/clickandbuilds\/BetaWeb\/wp-includes\/class-wp-hook.php(292): Ai1wm_Export_Controller::export(Array)\n#3 \/homepages\/4\/d42877117\/htdocs\/clickandbuilds\/BetaWeb\/wp-includes\/class-wp-hook.php(316): WP_Hook->apply_filters('', Array)\n#4 \/homepages\/4\/d42877117\/htdocs\/clickandbuilds\/BetaWeb\/wp-includes\/plugin.php(484): WP_Hook->do_action(Array)\n#5 \/homepages\/4\/d42877117\/htdocs\/clickandbuilds\/BetaWeb\/wp-admin\/admin-ajax.php(187): do_action","file":"\/homepages\/4\/d42877117\/htdocs\/clickandbuilds\/BetaWeb\/wp-content\/plugins\/all-in-one-wp-migration\/functions.php","line":87}

Jun 24 2021 11:22:49
{"type":1,"message":"Uncaught Error: Call to undefined function ai1wm_storage_path() in \/homepages\/4\/d42877117\/htdocs\/clickandbuilds\/BetaWeb\/wp-content\/plugins\/all-in-one-wp-migration\/functions.php:87\nStack trace:\n#0 \/homepages\/4\/d42877117\/htdocs\/clickandbuilds\/BetaWeb\/wp-content\/plugins\/all-in-one-wp-migration\/lib\/model\/export\/class-ai1wm-export-archive.php(38): ai1wm_archive_path(Array)\n#1 \/homepages\/4\/d42877117\/htdocs\/clickandbuilds\/BetaWeb\/wp-content\/plugins\/all-in-one-wp-migration\/lib\/controller\/class-ai1wm-export-controller.php(70): Ai1wm_Export_Archive::execute(Array)\n#2 \/homepages\/4\/d42877117\/htdocs\/clickandbuilds\/BetaWeb\/wp-includes\/class-wp-hook.php(292): Ai1wm_Export_Controller::export(Array)\n#3 \/homepages\/4\/d42877117\/htdocs\/clickandbuilds\/BetaWeb\/wp-includes\/class-wp-hook.php(316): WP_Hook->apply_filters('', Array)\n#4 \/homepages\/4\/d42877117\/htdocs\/clickandbuilds\/BetaWeb\/wp-includes\/plugin.php(484): WP_Hook->do_action(Array)\n#5 \/homepages\/4\/d42877117\/htdocs\/clickandbuilds\/BetaWeb\/wp-admin\/admin-ajax.php(187): do_action","file":"\/homepages\/4\/d42877117\/htdocs\/clickandbuilds\/BetaWeb\/wp-content\/plugins\/all-in-one-wp-migration\/functions.php","line":87}

Jun 24 2021 11:22:50
{"type":1,"message":"Uncaught Error: Call to undefined function ai1wm_storage_path() in \/homepages\/4\/d42877117\/htdocs\/clickandbuilds\/BetaWeb\/wp-content\/plugins\/all-in-one-wp-migration\/functions.php:87\nStack trace:\n#0 \/homepages\/4\/d42877117\/htdocs\/clickandbuilds\/BetaWeb\/wp-content\/plugins\/all-in-one-wp-migration\/lib\/model\/export\/class-ai1wm-export-archive.php(38): ai1wm_archive_path(Array)\n#1 \/homepages\/4\/d42877117\/htdocs\/clickandbuilds\/BetaWeb\/wp-content\/plugins\/all-in-one-wp-migration\/lib\/controller\/class-ai1wm-export-controller.php(70): Ai1wm_Export_Archive::execute(Array)\n#2 \/homepages\/4\/d42877117\/htdocs\/clickandbuilds\/BetaWeb\/wp-includes\/class-wp-hook.php(292): Ai1wm_Export_Controller::export(Array)\n#3 \/homepages\/4\/d42877117\/htdocs\/clickandbuilds\/BetaWeb\/wp-includes\/class-wp-hook.php(316): WP_Hook->apply_filters('', Array)\n#4 \/homepages\/4\/d42877117\/htdocs\/clickandbuilds\/BetaWeb\/wp-includes\/plugin.php(484): WP_Hook->do_action(Array)\n#5 \/homepages\/4\/d42877117\/htdocs\/clickandbuilds\/BetaWeb\/wp-admin\/admin-ajax.php(187): do_action","file":"\/homepages\/4\/d42877117\/htdocs\/clickandbuilds\/BetaWeb\/wp-content\/plugins\/all-in-one-wp-migration\/functions.php","line":87}

Jun 24 2021 11:22:52
{"type":8192,"message":"Function create_function() is deprecated","file":"\/homepages\/4\/d42877117\/htdocs\/clickandbuilds\/BetaWeb\/wp-includes\/vars.php","line":13}

Jun 24 2021 11:22:52
{"type":1,"message":"Uncaught Error: Call to undefined function ai1wm_storage_path() in \/homepages\/4\/d42877117\/htdocs\/clickandbuilds\/BetaWeb\/wp-content\/plugins\/all-in-one-wp-migration\/functions.php:87\nStack trace:\n#0 \/homepages\/4\/d42877117\/htdocs\/clickandbuilds\/BetaWeb\/wp-content\/plugins\/all-in-one-wp-migration\/lib\/model\/export\/class-ai1wm-export-archive.php(38): ai1wm_archive_path(Array)\n#1 \/homepages\/4\/d42877117\/htdocs\/clickandbuilds\/BetaWeb\/wp-content\/plugins\/all-in-one-wp-migration\/lib\/controller\/class-ai1wm-export-controller.php(70): Ai1wm_Export_Archive::execute(Array)\n#2 \/homepages\/4\/d42877117\/htdocs\/clickandbuilds\/BetaWeb\/wp-includes\/class-wp-hook.php(292): Ai1wm_Export_Controller::export(Array)\n#3 \/homepages\/4\/d42877117\/htdocs\/clickandbuilds\/BetaWeb\/wp-includes\/class-wp-hook.php(316): WP_Hook->apply_filters('', Array)\n#4 \/homepages\/4\/d42877117\/htdocs\/clickandbuilds\/BetaWeb\/wp-includes\/plugin.php(484): WP_Hook->do_action(Array)\n#5 \/homepages\/4\/d42877117\/htdocs\/clickandbuilds\/BetaWeb\/wp-admin\/admin-ajax.php(187): do_action","file":"\/homepages\/4\/d42877117\/htdocs\/clickandbuilds\/BetaWeb\/wp-content\/plugins\/all-in-one-wp-migration\/functions.php","line":87}

Jun 24 2021 11:22:55
{"type":8192,"message":"Function create_function() is deprecated","file":"\/homepages\/4\/d42877117\/htdocs\/clickandbuilds\/BetaWeb\/wp-includes\/vars.php","line":13}

Jun 24 2021 11:22:56
{"type":1,"message":"Uncaught Error: Call to undefined function ai1wm_storage_path() in \/homepages\/4\/d42877117\/htdocs\/clickandbuilds\/BetaWeb\/wp-content\/plugins\/all-in-one-wp-migration\/functions.php:87\nStack trace:\n#0 \/homepages\/4\/d42877117\/htdocs\/clickandbuilds\/BetaWeb\/wp-content\/plugins\/all-in-one-wp-migration\/lib\/model\/export\/class-ai1wm-export-archive.php(38): ai1wm_archive_path(Array)\n#1 \/homepages\/4\/d42877117\/htdocs\/clickandbuilds\/BetaWeb\/wp-content\/plugins\/all-in-one-wp-migration\/lib\/controller\/class-ai1wm-export-controller.php(70): Ai1wm_Export_Archive::execute(Array)\n#2 \/homepages\/4\/d42877117\/htdocs\/clickandbuilds\/BetaWeb\/wp-includes\/class-wp-hook.php(292): Ai1wm_Export_Controller::export(Array)\n#3 \/homepages\/4\/d42877117\/htdocs\/clickandbuilds\/BetaWeb\/wp-includes\/class-wp-hook.php(316): WP_Hook->apply_filters('', Array)\n#4 \/homepages\/4\/d42877117\/htdocs\/clickandbuilds\/BetaWeb\/wp-includes\/plugin.php(484): WP_Hook->do_action(Array)\n#5 \/homepages\/4\/d42877117\/htdocs\/clickandbuilds\/BetaWeb\/wp-admin\/admin-ajax.php(187): do_action","file":"\/homepages\/4\/d42877117\/htdocs\/clickandbuilds\/BetaWeb\/wp-content\/plugins\/all-in-one-wp-migration\/functions.php","line":87}

Jun 24 2021 11:22:58
{"type":8192,"message":"Function create_function() is deprecated","file":"\/homepages\/4\/d42877117\/htdocs\/clickandbuilds\/BetaWeb\/wp-includes\/vars.php","line":13}

Jun 24 2021 11:23:00
{"type":1,"message":"Uncaught Error: Call to undefined function ai1wm_storage_path() in \/homepages\/4\/d42877117\/htdocs\/clickandbuilds\/BetaWeb\/wp-content\/plugins\/all-in-one-wp-migration\/functions.php:87\nStack trace:\n#0 \/homepages\/4\/d42877117\/htdocs\/clickandbuilds\/BetaWeb\/wp-content\/plugins\/all-in-one-wp-migration\/lib\/model\/export\/class-ai1wm-export-archive.php(38): ai1wm_archive_path(Array)\n#1 \/homepages\/4\/d42877117\/htdocs\/clickandbuilds\/BetaWeb\/wp-content\/plugins\/all-in-one-wp-migration\/lib\/controller\/class-ai1wm-export-controller.php(70): Ai1wm_Export_Archive::execute(Array)\n#2 \/homepages\/4\/d42877117\/htdocs\/clickandbuilds\/BetaWeb\/wp-includes\/class-wp-hook.php(292): Ai1wm_Export_Controller::export(Array)\n#3 \/homepages\/4\/d42877117\/htdocs\/clickandbuilds\/BetaWeb\/wp-includes\/class-wp-hook.php(316): WP_Hook->apply_filters('', Array)\n#4 \/homepages\/4\/d42877117\/htdocs\/clickandbuilds\/BetaWeb\/wp-includes\/plugin.php(484): WP_Hook->do_action(Array)\n#5 \/homepages\/4\/d42877117\/htdocs\/clickandbuilds\/BetaWeb\/wp-admin\/admin-ajax.php(187): do_action","file":"\/homepages\/4\/d42877117\/htdocs\/clickandbuilds\/BetaWeb\/wp-content\/plugins\/all-in-one-wp-migration\/functions.php","line":87}

I would be very grateful for any help.

With best regards,
Heiko Witt

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