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It means you do not have any 'live' backups in /var/lib/psa/dumps. I suggest to rename the folder /var/lib/psa/dumps, e.g. to /var/lib/psa/dumps.old and create the new one with the same permissions. Lately /var/lib/psa/dumps.old can be deleted.
Could you run another command?
find /var/lib/psa/dumps -name '*.xml' | wc -l
And are there any extra directories in /var/lib/psa/dumps? Standard structure is described here.
Try to use the option ftpForbidReuseConnection in panel.ini
[pmm]
ftpForbidReuseConnection = 1
Or uncheck the option "Require TLS session resumption on data connection when using PROT P" in Filezilla server settings.
The error "Failed sending data to the peer" means an FTP server closes a connection during backup creation. It is most likely some timeouts exceed on the FTP server side and you should tune them.
It is possibly to tune disk space required in /usr/local/psa/admin/share/pmmcli/pmmcli-rc via the option
USED_SPACE_COEFFICIENT 0.7
or exclude free disk space checking at all via the option
CHECK_BACKUP_DISK_SPACE 0
When you restore from an incremental backup all previous incremental backups (up to ~30 backups in your case) and a full backup are downloaded from an FTP server and extracted to the local storage. To minimize restoration time you can perform full backup weekly.
To continue investigation you...
Do your backups opened without any errors? Or can you unpack them manually? Also you may check manually size and modification time of some file backed up by using stat command.
What FTP server do you use (ProFTPD, vsftpd ...)? Could you attempt to use another FTP server? Also make sure the option ftpForbidReuseConnection = 1 is in [pmm] section and there is only its definition.
Make sure you have 17.5.3 MU8 or above installed
Add the option ftpForbidReuseConnection to the file /usr/local/psa/admin/conf/panel.ini
[pmm]
ftpForbidReuseConnection = 1