“ERROR: Method to archive file” in version 3.4.2

Hello,
When I run backup jobs in version 3.4.2, it raises an error, and abort the job after a few times attempt. The issue doesn’t exist in 3.4.1.

Here is the logs:
[03-Oct-2017 00:19:12] 1. Try to backup database …
[03-Oct-2017 00:19:12] Connected to database wordpress on localhost
[03-Oct-2017 00:19:13] Added database dump “backwpup_29xxcixqf5_wordpress.sql” with 27.09 MB to backup file list
[03-Oct-2017 00:19:13] Database backup done!
[03-Oct-2017 00:19:13] 1. Trying to make a list of folders to back up …
[03-Oct-2017 00:19:14] Added “wp-config.php” to backup file list
[03-Oct-2017 00:19:14] 1274 folders to backup.
[03-Oct-2017 00:19:14] 1. Trying to generate a file with installed plugin names …
[03-Oct-2017 00:19:14] Added plugin list file “backwpup_10cbmta9z5_xxxxxxxx.pluginlist.2017-10-03.txt.gz” with 1.97 KB to backup file list.
[03-Oct-2017 00:19:14] 1. Trying to generate a manifest file …
[03-Oct-2017 00:19:14] Added manifest.json file with 5.17 KB to backup file list.
[03-Oct-2017 00:19:14] 1. Trying to create backup archive …
[03-Oct-2017 00:19:14] ERROR: Method to archive file backwpup_1t6lob22o1_8dd8ae639ed2e800 not detected
[03-Oct-2017 00:19:14] 2. Trying to create backup archive …
[03-Oct-2017 00:19:14] ERROR: Method to archive file backwpup_1t6lob22o1_8dd8ae639ed2e800 not detected
[03-Oct-2017 00:19:14] 3. Trying to create backup archive …
[03-Oct-2017 00:19:14] ERROR: Method to archive file backwpup_1t6lob22o1_8dd8ae639ed2e800 not detected
[03-Oct-2017 00:19:14] ERROR: Step aborted: too many attempts!

Here is my system information:
WordPress version: 4.8.2
BackWPup version: 3.4.2
PHP version: 7.0.22-0ubuntu0.16.04.1 (64bit)
MySQL version: 5.7.19-0ubuntu0.16.04.1
cURL version: 7.47.0
cURL SSL version: OpenSSL/1.0.2g
WP-Cron url: https:/xxxxxx/wp-cron.php
Server self connect: Response Test O.K.
Document root: /var/web/www
Temp folder: /var/web/www/wp-content/uploads/backwpup-3f1cfd-temp/
Log folder: /var/web/www/wp-content/uploads/backwpup-3f1cfd-logs/
Server: nginx/1.10.3
Operating System: Linux
PHP SAPI: fpm-fcgi
Current PHP user: www-data
Maximum execution time: 30 seconds
Alternative WP Cron: Off
Disabled WP Cron: Off
CHMOD Dir: 0755
Server Time: 16:30
Blog Time: 00:30
Blog Timezone: Asia/Shanghai
Blog Time offset: 8 hours
Blog language: zh-CN
MySQL Client encoding: utf8
PHP Memory limit: 256M
WP memory limit: 40M
WP maximum memory limit: 256M
Memory in use: 4.00 MB
Disabled PHP Functions:: pcntl_alarm, pcntl_fork, pcntl_waitpid, pcntl_wait, pcntl_wifexited, pcntl_wifstopped, pcntl_wifsignaled, pcntl_wifcontinued, pcntl_wexitstatus, pcntl_wtermsig, pcntl_wstopsig, pcntl_signal, pcntl_signal_dispatch, pcntl_get_last_error, pcntl_strerror, pcntl_sigprocmask, pcntl_sigwaitinfo, pcntl_sigtimedwait, pcntl_exec, pcntl_getpriority, pcntl_setpriority,
Loaded PHP Extensions:: Core, PDO, Phar, Reflection, SPL, Zend OPcache, calendar, cgi-fcgi, ctype, curl, date, exif, fileinfo, filter, ftp, gettext, hash, iconv, json, libxml, mysqli, mysqlnd, openssl, pcre, pdo_mysql, posix, readline, session, shmop, sockets, standard, sysvmsg, sysvsem, sysvshm, tokenizer, zip, zlib

Regards.